KANG JianLi

Research Institute of Petroleum Exploration and Development

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Huichu Wang

China Geological Survey

Zhibin Xiao

China University of Petroleum, East China

Yunwei Ren

China Geological Survey

Zhenqun Xiang

China Geological Survey

Dongyang Zhang

Sericultural Research Institute

Xiang Zhenqun

Chongqing Institute of Geology and Mineral Resources

Jianrong Li

Bohai University

Chunji Xue

China University of Geosciences (Beijing)

WANG Zhi

Zhaochong Zhang

China University of Geosciences (Beijing)

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China Geological Survey

Chongqing Institute of Geology and Mineral Resources

China University of Geosciences (Beijing)

China University of Geosciences

Czech Academy of Sciences, Institute of Geology

Jiangnan University

State Key Laboratory of Geological Processes and Mineral Resources

Peking University

Chinese Academy of Geological Sciences

Ministry of Natural Resources

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The Baiyunchanghe A-type granites in Guyang area, Inner Mongolia: Age, geochemistry, Hf isotope and response to the breakup of Columbia supercontinent

Acta Petrologica Sinica (2020)

KANG JianLi Huichu Wang Yunwei Ren Zhibin Xiao Xiang Zhenqun

在对固阳白云常合山花岗岩详细的野外地质调查基础上，对其岩相学、地球化学、锆石U-Pb年代学及Lu-Hf同位素特征进行了综合研究。白云常合山花岗岩的地球化学特征显示其具有高SiO2（70.68%~77.21%）、富碱（7.88%~9.21%）、高Fe2O3T/MgO（12.60~90.38）和10000×Ga/Al（3.63~6.17）值，低Al2O3（11.70%~13.23%）、MgO（0.06%~0.24%）、CaO（0.23%~1.20%）的特征；微量元素富集Rb、Th、K等，亏损Ba、Sr、Eu、Ti、P；稀土元素总量较高，轻稀土富集，重稀土亏损，呈现典型的右倾'海鸥型'分布模式，具有明显的Eu负异常。通过锆石饱和温度的计算，得到白云常合山花岗岩的结晶温度为824~957℃，平均值为903℃，表明其形成于高温环境。这些特征与A型花岗岩相一致。锆石LA-ICP-MS年龄测试结果显示，白云常合山花岗岩形成于~1720Ma；锆石eHf（t）=-1.84~+6.08，以正值为主，单阶段模式年龄和二阶段模式年龄分别为1.9~2.2Ga和2.5~3.2Ga，岩浆源区主要是新太古代新生地壳，在上升过程中可能受到古老地壳物质的混染。构造环境判别图解显示其为A1型花岗岩，且有板内岩浆的特点，因此白云常合山花岗岩应该是大陆裂谷岩浆活动的产物。结合区域上与裂解事件有关地质体的同位素年代学资料，认为白云常合山花岗岩应该是固阳地区年龄可靠的最早响应哥伦比亚超大陆裂解的岩体。

Supercontinent

Inner mongolia

Rodinia

10.18654/1000-0569/2020.08.10

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New Evidence for the formation age of the Lüliang Group

Acta Petrologica Sinica (2020)

Huichu Wang Peisen Miao KANG JianLi Yunwei Ren Jiahui Zhang

10.18654/1000-0569/2020.08.03

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Petrogenesis of Late Carboniferous to Early Permian Granitoid Plutons in the Chinese South Tianshan:Implications for Crustal Accretion

He Huang Zhaochong Zhang Dongyang Zhang DU Hongxing Letian Ma

A large volume of granitoid plutons formed in the South Tianshan orogenic belt during Late Carboniferous to Early Permian.These rocks can be generally classified as Late Carboniferous I-type granites,Early Permian I and S-type granites,and A-type granites that formed at ~275 Ma.The different rocks have some differences in features of source regions and temperature and pressure conditions under which magma evolves,which reflect the development process of tectonic environment during that period.In this paper,seven granitoid plutons in the Chinese South Tianshan orogenic belt,including Tielieke pluton,Mangqisu pluton,Yingmailai pluton,Chuanwulu pluton,Baleigong pluton,Huoshibulake pluton and Mazhashan pluton,were chosen for geochronological,petrological,and geochemical investigations.The Tielieke and Mangqisu plutons are Late Carboniferous I-type granites and the magmas formed due to partial melting of the metaigneous rocks in the lower crust under the condition of the syn-collisional tectonics.The Early Permian S-type granite is represented by the Yingmailai pluton,which was the result of remelting of Mesoproterozoic metasedimentary rocks induced by the radiogenic heating.Felsic rocks in the Chuanwulu pluton are Early Permian I-type granites,representing the hybrid magmas derived from the lower part of the thickened continental crust.The mafic rocks in the Chuanwulu pluton represent underplating mantle-derived magma resulted from partial melting of enrichment metasomatized lithospheric mantle.The Yingmailai and Chuanwulu plutons formed in a transition stage of tectonic regimes from syn-collisional compression to post-collisional extension.A-type granites forming at ~275 Ma represents a high temperature granitic magma,which resulted from the interaction between asthenosphere and lower crust under a condition of low pressures.The Baleigong pluton is A2-type granite representing the epilogue of the post-collisional setting.The Huoshibulake and Mazhashan plutons,however,are A1-type granite indicative of intra-plate rifting regime.

Underplating

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Tectonic setting and new division of evolution stages of Jiao-Liao-Ji belt: Implications from metagabbros in Jiaobei terrane

Acta Petrologica Sinica (2021)

Huichu Wang KANG JianLi Yunwei Ren Zhibin Xiao Zhenqun Xiang

祥山和于埠变质辉长岩是胶北地块上古元古代变质镁铁质岩石的典型代表,辉长岩侵入古元古代荆山群野头组,产有"祥山式"岩浆熔离型铁矿,成矿的专属性指示辉长岩属于层状侵入体类型,形成于大陆伸展构造背景。在祥山变质辉长岩中获得了1851±9Ma的变质年龄,在于埠变质辉长岩中获得了2052±23Ma的锆石U-Pb成岩年龄和1834±5Ma的变质年龄。~2.05Ga的岩浆结晶锆石的ε_Hf(t)值均为正值(+1.87~+3.64),一阶段Hf模式年龄(t_DM)为2292~2381Ma(平均为2327Ma),指示于埠变质辉长岩源自古元古代中期的亏损地幔。于埠变质辉长岩的成岩年龄制约了荆山群野头组的沉积上限,荆山群中至少有一部分形成于2.2~2.05Ga之间,沉积于大陆裂谷-稳定大陆边缘的构造环境。祥山和于埠变质辉长岩中有少量斜长花岗岩与之伴生,这些斜长花岗岩具有类似于大洋斜长花岗岩的岩石特征,低K、Ti、Sr,高Na、Yb,形成于低压背景;从斜长花岗岩中获得了1848±8Ma和1873±5Ma的锆石U-Pb年龄,斜长花岗岩中的锆石Th/U比值较低(0.01~0.29),具有初始熔体中结晶锆石特征。结合斜长花岗岩的地球化学特征,推测它们是辉长岩部分熔融的产物,并指示~1.87Ga已由挤压构造体制转变为伸展构造体制。综合前人研究成果,胶北地块已识别出2.18~2.15Ga、~2.10Ga、~2.05Ga的三期双峰式岩浆岩构造组合,指示2.2~2.05Ga期间总体为伸展构造背景。因此建议胶-辽-吉活动带的形成演化过程划分为两个阶段,早期为大陆裂解-稳定陆缘演化阶段(2.2~2.0Ga),沉积了巨量的陆缘碎屑岩-碳酸盐岩建造;晚期为俯冲-碰撞造山阶段(2.0~1.85Ga),胶-辽-吉活动带褶皱造山。

10.18654/1000-0569/2021.01.12

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Citations (8)