Continuous crustal thinning of the North China Craton in the Early Cretaceous: Evidence from A-type granites
文献类型：期刊论文
| 作者 | Li, Ao1; Yang, Wu -Bin1,2; Niu, He-Cai1,2; Zeng, Ling -Jun1; Li, Ning-Bo1,2; Hollings, Pete3 |
| 刊名 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
 |
| 出版日期 | 2024-03-01 |
| 卷号 | 136期号:3-4页码:1445-1457 |
| ISSN号 | 0016-7606 |
| DOI | 10.1130/B36917.1 |
| 英文摘要 | Widespread crust-derived granitoids in North China provide evidence of Mesozoic lithospheric thinning and destruction of the North China Craton. However, the link between lower crust and lithospheric mantle reactivation remains poorly understood. We present whole-rock geochemistry and zircon O-Hf isotopes for Early Cretaceous peralkaline A-type granites (i.e., Xiwanzi, Xiangshan, and Yansehu) from the Yanshan Mountains of the eastern block of the North China Craton. The Xiwanzi granite has a U-Pb age of 134.3 +/- 0.4 Ma, with homogeneous whole-rock Nd isotopes [e(Nd)(t) = -7.7 to -7.5] but highly variable zircon O-Hf isotopes [delta O-18 = 5.1%0 to 7.2%0 and e(Hf)(t) = -7.7 to +9.6]. Such isotopic variations likely resulted from a hybrid juvenile source consisting of partial melting of newly underplated basaltic rocks derived from both the metasomatized ancient and juvenile sub-continental lithospheric mantle. In contrast, the Xiangshan (117.4 +/- 1.0 Ma) and Yansehu (116.3 +/- 1.4 Ma) granites have relatively uniform isotopic compositions [whole-rock e(Nd)(t) = -12.2 to -10.8, zircon delta O-18 = 5.2%0 to 6.4%0, and e(Hf)(t) = -17.1 to -4.7], close to those of the Proterozoic mafic granulite xenoliths from the ancient lower crust. The isotopic variations of the Early Cretaceous A-type granites suggest a continuous change in the melting model from the underplated juvenile lowermost crust to the overlying ancient lower crust at high temperatures in an extensional environment. Our results indicate that A-type reactivation of the lower crust of an Archean craton. Significantly, large-scale continuous thinning of lower continental crust provides key insights into the generation of the wide- spread Mesozoic crust -derived granitoids in North China. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001187125300009 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77160]  |
| 专题 | 中国科学院矿物学与成矿学重点实验室 |
| 通讯作者 | Yang, Wu -Bin |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Lakehead Univ, Dept Geol, Thunder Bay, ON P7B 5E1, Canada |
| 推荐引用方式 GB/T 7714 | Li, Ao,Yang, Wu -Bin,Niu, He-Cai,et al. Continuous crustal thinning of the North China Craton in the Early Cretaceous: Evidence from A-type granites[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2024,136(3-4):1445-1457. |
| APA | Li, Ao,Yang, Wu -Bin,Niu, He-Cai,Zeng, Ling -Jun,Li, Ning-Bo,&Hollings, Pete.(2024).Continuous crustal thinning of the North China Craton in the Early Cretaceous: Evidence from A-type granites.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,136(3-4),1445-1457. |
| MLA | Li, Ao,et al."Continuous crustal thinning of the North China Craton in the Early Cretaceous: Evidence from A-type granites".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 136.3-4(2024):1445-1457. |
入库方式： OAI收割
来源：广州地球化学研究所
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