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学者姓名：黎敦朋
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Abstract ：
福建将乐新路口钨矿是闽西北地区石英脉型钨矿的代表性矿床之一，然而对其成矿时代尚未开展过研究。为了了解新路口石英脉型钨矿床的成矿时代和矿石成份，对黑钨矿进行了电子探针成份分析和LA-ICPMS U-Pb测年，结果显示：黑钨矿WO3为74.147%~75.491%，MnO的含量为9.601%~16.311%，FeO的含量为8.921%~14.903%；FeO/MnO平均值为0.784，总体富锰，属于钨锰铁矿；黑钨矿LA-ICP-MS U-Pb的T-W下交点年龄为147.0 ± 2.6 Ma (MSWD = 0.51)，校正后的206Pb/238U加权平均年龄为145.2 ± 2.6 Ma (n = 21, MSWD = 1.6)，成矿年龄为晚侏罗世。The Xinlukou tungsten deposit in Jiangle, Fujian Province is one of the representative deposits of quartz vein type tungsten deposits in northwestern Fujian, however, its metallogenic age has not been studied. In order to understand the metallogenic age and ore composition of the Xinlukou quartz vein type tungsten deposit, the electron microprobe composition analysis and LA-ICPMS U-Pb dating of wolframite were carried out. The results show that the content of WO3 is 74.147%~75.491%, the content of MnO is 9.601%~16.311%, and the content of FeO is 8.921%~14.903%. The average value of FeO/MnO is 0.784, which is rich in manganese and belongs to tungsten manganese iron ore. The LA-ICP-MS U-Pb T-W lower intercept age of the wolframite is 147.0 ± 2.6 Ma (MSWD = 0.51), the corrected 206Pb/238U weighted average age is 145.2 ± 2.6 Ma (n = 21, MSWD = 1.6), and the metallogenic age is Late Jurassic.
Keyword ：
Electron Microprobe Electron Microprobe Quartz Vein Type Tungsten Deposit Quartz Vein Type Tungsten Deposit U-Pb Dating U-Pb Dating U-Pb测年 U-Pb测年 Wolframite Wolframite Xinlukou Tungsten Deposit Xinlukou Tungsten Deposit 新路口钨矿床 新路口钨矿床 电子探针 电子探针 石英脉型钨矿 石英脉型钨矿 黑钨矿 黑钨矿
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| GB/T 7714 | 王汉滨 , 黎敦朋 , 程浩楠 . 福建将乐县新路口石英脉型钨矿床黑钨矿电子探针分析和LA-ICPMS U-Pb测年 [J]. | 地球科学前沿 , 2024 , 14 (9) : 1183-1191 . |
| MLA | 王汉滨 等. "福建将乐县新路口石英脉型钨矿床黑钨矿电子探针分析和LA-ICPMS U-Pb测年" . | 地球科学前沿 14 . 9 (2024) : 1183-1191 . |
| APA | 王汉滨 , 黎敦朋 , 程浩楠 . 福建将乐县新路口石英脉型钨矿床黑钨矿电子探针分析和LA-ICPMS U-Pb测年 . | 地球科学前沿 , 2024 , 14 (9) , 1183-1191 . |
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Abstract ：
紫金山金铜矿床是世界级的超大型矿床，具有上金下铜的分带特征，上部金矿已开采完毕，中下部铜矿体尚未圈闭，开展流体包裹体均一温度测量对确定成矿的热源中心和找矿方向研究具有重要的指导意义。本文在野外地质调查、流体包裹体样品采集、岩相学观察的基础上，对露天采矿场海拔560~580 m平台与铜矿体共生的蚀变石英、明矾石开展了流体包裹体均一温度和冰点温度的测量，结果表明：流体包裹体主要有液相包裹体、气相包裹体、CO2包裹体以及少量含子矿物多相包裹体4种类型；流体包裹体均一温度范围为120.9℃~430.1℃，主要集中于160℃~220℃和360℃~380℃，显示具有2个成矿温度峰值，可能暗示具有2次成矿作用；冰点温度−0.1℃~−13.0℃，对应盐度为0.18% NaCl eqv~16.89% NaCl eqv。根据流体包裹体均一温度中较高温度峰值绘制的流体包裹体均一温度等值线图显示成矿热源来自矿区的东南侧深部，并向南东方向倾伏，指示矿区东南侧深部仍具有较大的找矿前景。
Keyword ：
Fluid Inclusions Fluid Inclusions Ore-Forming Heat Source Ore-Forming Heat Source the Contour Map of the Homogenization Temperature the Contour Map of the Homogenization Temperature Zijinshan Copper-Gold Deposit Zijinshan Copper-Gold Deposit 均一温度等值线 均一温度等值线 成矿热源 成矿热源 流体包裹体 流体包裹体 紫金山金铜矿床 紫金山金铜矿床
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| GB/T 7714 | 杨小敏 , 付一航 , 黎敦朋 . 福建紫金山金铜矿床下部铜矿体流体包裹体均一温度测量及地质意义 [J]. | 地球科学前沿 , 2024 , 14 (4) : 358-366 . |
| MLA | 杨小敏 等. "福建紫金山金铜矿床下部铜矿体流体包裹体均一温度测量及地质意义" . | 地球科学前沿 14 . 4 (2024) : 358-366 . |
| APA | 杨小敏 , 付一航 , 黎敦朋 . 福建紫金山金铜矿床下部铜矿体流体包裹体均一温度测量及地质意义 . | 地球科学前沿 , 2024 , 14 (4) , 358-366 . |
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为探讨北秦岭造山带晚中生代岩浆复杂多样的成因机制，以北秦岭中段翠华山、大峪及库峪地区晚中生代二长花岗岩为研究对象，利用电子探针技术对其中的黑云母进行地球化学分析.结果显示，所采样品中的黑云母主体属于镁质黑云母，其成因类型为原生黑云母.矿物化学数据计算结果显示，翠华山、大峪及库峪二长花岗岩样品中黑云母的结晶压力均值分别为205、 202、 211 MPa,对应结晶深度分别为7.8、 7.6、 8.0 km,结晶温度均值分别为711、 653、 657℃,氧逸度均值分别为-16.45、-18.40、-18.27.基于上述结果分析，揭示研究区二长花岗岩主要物质来源于地壳并有少量幔源物质加入，翠华山、大峪及库峪二长花岗岩具有I型花岗岩亲缘性，均属于造山带钙碱性花岗岩系.
Keyword ：
二长花岗岩 二长花岗岩 北秦岭 北秦岭 岩石成因 岩石成因 黑云母 黑云母
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| GB/T 7714 | 陈楠 , 黄艳娜 , 黎敦朋 et al. 北秦岭翠华山-库峪一带晚中生代花岗岩黑云母地球化学特征及成因 [J]. | 福州大学学报(自然科学版) , 2024 , 52 (04) : 496-504 . |
| MLA | 陈楠 et al. "北秦岭翠华山-库峪一带晚中生代花岗岩黑云母地球化学特征及成因" . | 福州大学学报(自然科学版) 52 . 04 (2024) : 496-504 . |
| APA | 陈楠 , 黄艳娜 , 黎敦朋 , 付一航 , 杨小敏 . 北秦岭翠华山-库峪一带晚中生代花岗岩黑云母地球化学特征及成因 . | 福州大学学报(自然科学版) , 2024 , 52 (04) , 496-504 . |
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Fozi Mountain National Geopark is located in Zhenghe County in the northern region of Fujian Province, where the volcanic rocks of the Zhaixia Formation of the Shimaoshan Group are exposed. Zircon U-Pb dating and geochemical analysis were carried out to constrain its age and tectonic environment. The results show that three zircon U-Pb dating samples have attained ages of 99.2 +/- 1.0 Ma, 99.6 +/- 0.8 Ma, and 99.7 +/- 2.0 Ma. Volcanic rocks in the core scenic area of Fozi Mountain were formed during the Late Cretaceous period. Elemental analysis showed that these volcanic rocks were dominated by the shoshonite series. They include gray dacite porphyry, grayish-white breccia tuff, volcanic agglomerate, and gray tuffaceous sandstone. These rocks were characterized by high silicon, high alkali content, and rich potassium levels. Lu-Hf isotope analysis of zircons revealed that their epsilon Hf(t) values varied from -8.7 to -6.8. The corresponding TDM2 values were primarily distributed in the range of 1.71 Ga to 1.59 Ga. These findings indicated that the magma primarily originated from the partial melting of the Mesoproterozoic crystalline basement, accompanied by a small number of mantle-derived materials. Tectonic environment analysis indicated that these rocks were formed in the post-orogenic intraplate extensional environment, which was associated with the back-arc extension or lithospheric thinning caused by the subduction of the paleo-Pacific plate beneath the Eurasian plate. The formation of these volcanic rocks was attributed to post-orogenic magmatism.
Keyword ：
Fozi Mountain Fozi Mountain geochemistry geochemistry volcanic rock volcanic rock zircon Hf isotope zircon Hf isotope zircon U-Pb zircon U-Pb
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| GB/T 7714 | Chen, Nan , Li, Dunpeng , Huang, Yanna et al. Zircon U-Pb Dating, Geochemistry, Lu-Hf Isotope Characteristics, and Geological Significance of Volcanic Rocks in Zhenghe Fozi Mountain National Geopark, Fujian, China [J]. | MINERALS , 2024 , 14 (6) . |
| MLA | Chen, Nan et al. "Zircon U-Pb Dating, Geochemistry, Lu-Hf Isotope Characteristics, and Geological Significance of Volcanic Rocks in Zhenghe Fozi Mountain National Geopark, Fujian, China" . | MINERALS 14 . 6 (2024) . |
| APA | Chen, Nan , Li, Dunpeng , Huang, Yanna , Fu, Yihang , Yang, Xiaomin , Wang, Hanbin . Zircon U-Pb Dating, Geochemistry, Lu-Hf Isotope Characteristics, and Geological Significance of Volcanic Rocks in Zhenghe Fozi Mountain National Geopark, Fujian, China . | MINERALS , 2024 , 14 (6) . |
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In addition to overall uplift of the Qiabuqia region during the Late Cenozoic, three deformation stages can be identified in the northeastern Qinghai-Tibet Plateau. Specifically, these deformation stages were recognized in areas east of the Gonghe Basin that surrounds Waliguan Mountain and include: 1) Late Miocene to Late Pliocene deformation-dominated by thrust napping with dextral strike-slipping; 2) Early Pleistocene to late middle period of Pleistocene deformation-fault structures were dominated by the dextral strike-slipping with thrust napping; and 3) end of Late Pleistocene to Middle Holocene deformation-thrust napping slowed down and finally braked, while the shallow surface began to loosen and extend at Qiabuqia region's rear-edge. DR4 borehole drilling data indicate that the Xiangshuihe Formation's buried depth is similar to 1,000 m. The Xianshuihe Formation's top section is characterized by normal fault-type (NF) tectonic stress, while the maximum principal tectonic stress (sigma 1) is perpendicular and the minimum principal tectonic stress (sigma 3) is horizontal. In contrast, the deep basement is characterized by thrust fault (TF) and strike-slip (SS) tectonic stress, while the sigma 1 is in the NE-SW direction, ranging from 20.1 degrees to 75.3 degrees with an average of 40.0 degrees. Based on the aforementioned observations, it can be inferred that there are three sets of hidden faults in the basement of the Qiabuqia region: 1) the NW-NNW trending compressional-torsional faults; 2) the NE trending tensional-torsional faults; and 3) the NWW trending compressional-torsional faults. The findings in this study can potentially offer a robust geological basis for exploring and utilizing hot, dry rock resources within the Gonghe Basin.
Keyword ：
Gonghe Basin Gonghe Basin hot dry rock hot dry rock Late Cenozoic Late Cenozoic normal fault normal fault strike-slip fault strike-slip fault tectonic stress field tectonic stress field thrust nappe thrust nappe
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| GB/T 7714 | Zhang, Yang , Feng, Qingda , Li, Fucheng et al. Insights into the late Cenozoic structural deformation and tectonic stress field of the Qiabuqia region, Gonghe Basin, northeastern Qinghai-Tibetan Plateau [J]. | FRONTIERS IN EARTH SCIENCE , 2023 , 10 . |
| MLA | Zhang, Yang et al. "Insights into the late Cenozoic structural deformation and tectonic stress field of the Qiabuqia region, Gonghe Basin, northeastern Qinghai-Tibetan Plateau" . | FRONTIERS IN EARTH SCIENCE 10 (2023) . |
| APA | Zhang, Yang , Feng, Qingda , Li, Fucheng , Zhang, Linyou , Zhang, Chao , Zhang, Senqi et al. Insights into the late Cenozoic structural deformation and tectonic stress field of the Qiabuqia region, Gonghe Basin, northeastern Qinghai-Tibetan Plateau . | FRONTIERS IN EARTH SCIENCE , 2023 , 10 . |
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Late Mesozoic mafic dykes, which are widely developed in the North Qinling Orogenic Belt (NQOB), include abundant geodynamic information. This paper describes the mafic dykes that intrude the Late Jurassic granite in the Dayu and Kuyu areas, and reports important petrological constraints for the late Mesozoic tectonic transition from compression to extension in the NQOB. Three zircon U-Pb results show that the minimum ages of the mafic dykes are 139.8 +/- 1.4 Ma, 137.4 +/- 1.7 Ma and 133.4 +/- 0.9 Ma, indicating that the emplacement age of the Dayu and Kuyu mafic dykes is 140-133 Ma. Petrogeochemical analyses suggest that the mafic dykes belong to the high-K calc-alkaline shoshonite series with low SiO2 (46.93-56.73 wt%), MgO (1.88-9.10 wt%) and TiO2 (1.17-1.82 wt%), and high Al2O3 (13.98-17.46 wt%), TFe2O3 (7.81-10.92 wt%) and K2O (1.28-4.78 wt%). The mafic dykes are enriched in large ion lithophile elements (e.g. Rb, Ba, K, La, Sr) and depleted in high-field-strength elements (e.g. Nb, Ta, Zr, Ti). These samples have the right-sloping chondrite-normalised rare earth element patterns, which suggest light rare earth element enrichment and heavy rare earth elements depletion with no obvious Eu anomalies (delta Eu = 0.94-1.11). The I-Sr, epsilon(Nd)(t), epsilon(Hf) (t) and T-DM2(crust) values are 0.7056-0.7060, -10.60 to -5.98, -14.1 to -2.8, and 1382.4 +/- 25.1 to 2081.9 +/- 47.6 Ma, respectively. Both elemental and isotopic geochemistry show that the formation of Dayu and Kuyu mafic dykes is due to the partial decompression melting of previously enriched lithospheric mantle during a delamination process. The mafic dykes have undergone fractionation crystallisation of Mg-Fe phase minerals during magma ascent, accompanied by some crustal contamination. Combined with the regional tectonic setting, we suggested that the NQOB experienced intra-continental extension during the Early Cretaceous.
Keyword ：
delamination delamination Early Cretaceous Early Cretaceous mafic dykes mafic dykes North Qinling Orogenic Belt North Qinling Orogenic Belt Paleo-Pacific Plate subduction Paleo-Pacific Plate subduction partial melting partial melting
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| GB/T 7714 | Huang, Y. N. , Li, D. P. , Xiao, A. F. et al. Petrogenesis and tectonic setting of Early Cretaceous mafic dykes in the North Qinling Orogenic Belt, central China: constraints on the lithospheric lower crust delamination [J]. | AUSTRALIAN JOURNAL OF EARTH SCIENCES , 2023 , 70 (4) : 567-584 . |
| MLA | Huang, Y. N. et al. "Petrogenesis and tectonic setting of Early Cretaceous mafic dykes in the North Qinling Orogenic Belt, central China: constraints on the lithospheric lower crust delamination" . | AUSTRALIAN JOURNAL OF EARTH SCIENCES 70 . 4 (2023) : 567-584 . |
| APA | Huang, Y. N. , Li, D. P. , Xiao, A. F. , Xu, S. M. . Petrogenesis and tectonic setting of Early Cretaceous mafic dykes in the North Qinling Orogenic Belt, central China: constraints on the lithospheric lower crust delamination . | AUSTRALIAN JOURNAL OF EARTH SCIENCES , 2023 , 70 (4) , 567-584 . |
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秦岭翠华山水湫池地区分布的黑云母花岗岩是陕西翠华山国家山崩地质公园的崩塌母岩，目前还未见对其系统地开展年代学、地球化学研究。本文在野外调查的基础上，对翠华山水湫池地区分布的黑云母花岗岩首次进行了LA-ICP-MS锆石U-Pb测年、Lu-Hf同位素及全岩地球化学分析，获得锆石U-Pb加权平均年龄为149.4Ma±1.1 Ma,时代属于晚侏罗世；结合前人的研究成果资料，翠华山复式岩体可能存在～227 Ma、～150 Ma、～119 Ma三期岩浆侵位活动；全岩地球化学分析具有高硅(w(SiO_2)=69.83%～75.31%)、富钾(w(K_2O)=2.71%～5.23%)、弱过铝质(A/CNK=1.00～1.07)特征，属于高钾钙碱性-钾玄岩Ⅰ型花岗岩；其轻、重稀土分馏明显(w(LREE)/w(HREE)=10.09～67.50),富集LILE(K、La、Pb、Sr)、亏损HFSE(Ta、Nb、P、Ti),Eu呈弱负异常—轻微正异常，且显示高Sr低Y花岗岩特征；锆石Hf同位素分析得出ε_(Hf)(t)=-4.6～-1.4,T_(2DM(crust))=1.3 Ga～1.5 Ga,指示其可能为中元古代加厚下地壳物质部分熔融形成。
Keyword ：
北秦岭地区 北秦岭地区 晚侏罗世 晚侏罗世 翠华山 翠华山 部分熔融 部分熔融 锆石U-Pb测年 锆石U-Pb测年
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| GB/T 7714 | 黄艳娜 , 黎敦朋 , 肖爱芳 et al. 北秦岭造山带翠华山黑云母花岗岩LA-ICP-MS锆石U-Pb测年及地球化学特征 [J]. | 地质找矿论丛 , 2023 , 38 (02) : 197-208 . |
| MLA | 黄艳娜 et al. "北秦岭造山带翠华山黑云母花岗岩LA-ICP-MS锆石U-Pb测年及地球化学特征" . | 地质找矿论丛 38 . 02 (2023) : 197-208 . |
| APA | 黄艳娜 , 黎敦朋 , 肖爱芳 , 徐松明 . 北秦岭造山带翠华山黑云母花岗岩LA-ICP-MS锆石U-Pb测年及地球化学特征 . | 地质找矿论丛 , 2023 , 38 (02) , 197-208 . |
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干热岩大力开发有助于我国“双碳”目标的尽早实现，其中放射性生热是干热岩形成的重要因素之一，研究该类型干热岩地质特征和放射性生热特征，对选择该类型干热岩勘查目标区具有重要价值和现实意义。为此，以共和盆地兰采温泉群地区为线索，通过野外地质调查、地表放射性伽马测量、岩石放射性测试等手段，研究了高温温泉形成的地热地质条件和放射性特征，并依据地球物理勘查解译数据初步圈定了干热岩勘查目标靶区。研究结果表明：(1)兰采温泉地区擦拉更复式花岗岩体和羊智河—夏琼断裂与兰采温泉群的形成关系密切；(2)该区出露的中晚三叠世斑状二长花岗岩、钾长花岗岩和斑状钾长花岗岩等岩体的生热率表现出异常高的生热率特征，是正常沉积盖层生热率的5～8倍；(3)基于大地电磁测深勘查解译，羊智河—哲格姜—夏琼断裂破碎带下伏低阻体，推测为侵入时代较晚、温度较高的“体中体”花岗岩体。结论认为，该区具有“体中体”地质结构的晚三叠世高放射性斑状钾长花岗岩体，可作为干热岩勘查的主要目标方向；下一步应查明复式岩体空间分布形态，研究复式花岗岩体与地热流体的关系以及对深部温度场的影响机理，进而为圈定干热岩勘查靶区提供更加确凿的依据。
Keyword ：
“体中体”地质结构 “体中体”地质结构 兰采温泉群 兰采温泉群 共和盆地 共和盆地 勘查目标区 勘查目标区 地热地质 地热地质 大地电磁测深 大地电磁测深 干热岩 干热岩 放射性生热率 放射性生热率
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| GB/T 7714 | 贾小丰 , 李胜涛 , 张森琦 et al. 共和盆地兰采温泉地区地热特征及干热岩靶区 [J]. | 天然气工业 , 2023 , 43 (03) : 145-155 . |
| MLA | 贾小丰 et al. "共和盆地兰采温泉地区地热特征及干热岩靶区" . | 天然气工业 43 . 03 (2023) : 145-155 . |
| APA | 贾小丰 , 李胜涛 , 张森琦 , 张杨 , 黎敦朋 , 宋健 et al. 共和盆地兰采温泉地区地热特征及干热岩靶区 . | 天然气工业 , 2023 , 43 (03) , 145-155 . |
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vigorous development of hot dry rock is helpful to the early realization of "dual carbon" goal in China. Radiogenic heat generation is one of the important factors for the formation of hot dry rock. The study on the geological characteristics and radiogenic heat generation behaviors of this type of hot dry rock is of great value and practical significance in selecting the exploration target area of this type of hot dry rock. Taking Lancai hot spring group area of the Gonghe Basin as the research object, this paper studies the geothermal geological conditions for the formation of high-temperature hot spring and its radioactivity characteristics by means of field geological survey, surface radioactive gamma measurement and rock radioactivity test. In addition, the exploration target area of hot dry rock is preliminarily delineated based on geophysical exploration interpretation data. And the following research results are obtained. First, Yanlageng complex granite mass and Yangzhihe-Xiaqiong fault are closely related to the formation of Lancai hot spring group in the Lancai hot spring area. Second, the heat generation rate of outcropped Middle-Late Triassic porphyritic monzogranite, moyite and porphyraceous moyite in this area is unusually high, which is 5-8 times that of normal sedimentary caprock. Third, magnetotelluric sounding exploration interpretation shows that the Yangzhihe-Zhegejiang-Xiaqiong fault fracture zone is underlain by a low-resistivity body, which is inferred to be a "body-in-body" granite mass with later intrusion and higher temperature. In conclusion, there is Late Triassic high-radioactivity porphyraceous moyite mass with a "body-in-body" geological structure in this area, which can be used as the main target direction of hot dry rock exploration. What's more, it is suggested to figure out the spatial distribution pattern of complex rock mass and research the relationship between complex granite mass and geothermal fluid and its influence mechanism on the deep temperature field, so as to provide an accurate basis for delineating the exploration target area of hot dry rock. © 2023 Natural Gas Industry Journal Agency. All rights reserved.
Keyword ：
"Body-in-body" geological structure "Body-in-body" geological structure Exploration target area Exploration target area Geothermal geology Geothermal geology Gonghe Basin Gonghe Basin Hot dry rock Hot dry rock Lancai hot spring group Lancai hot spring group Magnetotelluric sounding Magnetotelluric sounding Radiogenic heat generation rate Radiogenic heat generation rate
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| GB/T 7714 | Jia, X. , Li, S. , Zhang, S. et al. Geothermal characteristics and hot dry rock target area in Lancai hot spring area of the Gonghe Basin; [共和盆地兰采温泉地区地热特征及干热岩靶区] [J]. | Natural Gas Industry , 2023 , 43 (3) : 145-155 . |
| MLA | Jia, X. et al. "Geothermal characteristics and hot dry rock target area in Lancai hot spring area of the Gonghe Basin; [共和盆地兰采温泉地区地热特征及干热岩靶区]" . | Natural Gas Industry 43 . 3 (2023) : 145-155 . |
| APA | Jia, X. , Li, S. , Zhang, S. , Zhang, Y. , Li, D. , Song, J. et al. Geothermal characteristics and hot dry rock target area in Lancai hot spring area of the Gonghe Basin; [共和盆地兰采温泉地区地热特征及干热岩靶区] . | Natural Gas Industry , 2023 , 43 (3) , 145-155 . |
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The North Qinling Orogenic Belt (NQOB) is a composite orogenic belt in central China. It started evolving during the Meso-Neoproterozoic period and underwent multiple stages of plate subduction and collision before entering intra-continental orogeny in the Late Triassic. The Meso-Cenozoic intra-continental orogeny and tectonic evolution had different responses in various terranes of the belt, with the tectonic evolution of the middle part of the belt being particularly controversial. The granites distributed in the Dayu and Kuyu areas in the middle part of the NQOB can provide an important window for revealing the geodynamic mechanisms of the NQOB. The main lithology of Dayu and Kuyu granites is biotite monzogranite, and the zircon U-Pb dating yielded intrusive ages of 151.3 & PLUSMN; 3.4 Ma and 147.7 & PLUSMN; 1.5 Ma, respectively. The dates suggest that the biotite monzogranite were formed at the end of the Late Jurassic. The whole-rock geochemistry analysis shows that the granites in the study areas are characterized by slightly high SiO2 (64.50-68.88 wt%) and high Al2O3 (15.12-16.24 wt%) and Na2O (3.55-3.80 wt%) contents. They are also enriched in light rare earth elements, large ion lithophile elements (e.g., Ba, K, La, Pb and Sr), and depleted in high field strength elements (HFSEs) (e.g., Ta, Nb, P and Ti). Additionally, the granites have weakly negative-slightly positive Eu anomalies (& delta;Eu = 0.91-1.19). Zircon Lu-Hf isotopic analysis showed & epsilon;Hf(t) = -6.1--3.8, and the two-stage model age is T2DM(crust) = 1.5-1.6 Ga. The granites in the study areas are analyzed as weak peraluminous high-K calc-alkaline I-type granites. They formed by partial melting of the thickened ancient lower crust, accompanied by the addition of minor mantle-derived materials. During magma ascent, they experienced fractional crystallization, with residual garnet and amphibole for a certain proportion in the magma source region. Comprehensive the geotectonic data suggest that the end of the Late Jurassic granite magmatism in the Dayu and Kuyu areas represents a compression-extension transition regime. It may have been a response to multiple tectonic mechanisms, such as the late Mesozoic intra-continental southward subduction of the North China Craton and the remote effect of the Paleo-Pacific Plate subduction. image
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I-type granite I-type granite Late Jurassic Late Jurassic North Qinling Orogenic Belt North Qinling Orogenic Belt partial melting partial melting tectonic transition tectonic transition
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| GB/T 7714 | Huang, Yanna , Li, Dunpeng , Xiao, Aifang et al. Geochronology, Petrogenesis and Tectonic Setting of the Late Jurassic I-type Granites in the North Qinling Orogenic Belt, Central China [J]. | ACTA GEOLOGICA SINICA-ENGLISH EDITION , 2023 , 97 (4) : 1132-1149 . |
| MLA | Huang, Yanna et al. "Geochronology, Petrogenesis and Tectonic Setting of the Late Jurassic I-type Granites in the North Qinling Orogenic Belt, Central China" . | ACTA GEOLOGICA SINICA-ENGLISH EDITION 97 . 4 (2023) : 1132-1149 . |
| APA | Huang, Yanna , Li, Dunpeng , Xiao, Aifang , Xu, Songming . Geochronology, Petrogenesis and Tectonic Setting of the Late Jurassic I-type Granites in the North Qinling Orogenic Belt, Central China . | ACTA GEOLOGICA SINICA-ENGLISH EDITION , 2023 , 97 (4) , 1132-1149 . |
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