文献类型：期刊文献

英文题名：High-silica rhyolites in the terminal stage of massive Cretaceous volcanism, SE China: Modified crustal sources and low-pressure magma chamber

作者：Li, Xi-Yao[1,2,3];Li, Sanzhong[1,2,3];Suo, Yanhui[1,2,3];Huang, Feng[4];Wang, Pengcheng[1,2,3];Luan, Shaorong[5];Zhou, Jie[1,2,3]

机构：[1]Ocean Univ China, MOE, Frontiers Sci Ctr Deep Ocean Multispheres & Earth, Key Lab Submarine Geosci & Prospecting Tech, Qingdao 266100, Peoples R China;[2]Ocean Univ China, Coll Marine Geosci, 238 Songling Rd, Qingdao 266100, Peoples R China;[3]Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China;[4]China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China;[5]East China Univ Sci & Technol, Res Ctr Anal & Test, Shanghai 200237, Peoples R China

年份：2022

卷号：102

起止页码：133

外文期刊名：GONDWANA RESEARCH

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000804188900003)】；

基金：Acknowledgement This research was funded by National Natural Science Foundation of China (No. 91958214, 41602042, U1606401-3) , Qingdao National Laboratory for Marine Science and Technology (No. 2017ASKJ02-04) , Fundamental Research Funds for the Central Universities (No. 201912026) , National Key Research and Development Program (No. 2017YFC0601401) . We are grateful to two anonymous reviewers for their constructive comments. We appreciate Prof. Min Sun for his con-structive suggestions on the manuscript. We thank J.L. Wang, H.R. Dou and F.C. Li for their assistance with the LA-ICP-MS and EMPA analyses.

语种：英文

外文关键词：Late Cretaceous; High-silica rhyolite; Southeast China; Petrogenesis; Magmatic evolution

摘要：Late Cretaceous felsic volcanism erupted as calderas in the terminal stage of the massive Cretaceous volcanism in SE China. This paper reports comprehensive geochemical and isotopic data for high-silica rhyolites from the Shiniushan and Xiaoxiong calderas in eastern Fujian-Zhejiang provinces, SE China. Zircon U-Pb dating constrains these rhyolites eruptions to 94-92 Ma and 93-89 Ma in the sites of the two calderas. All the samples possess high-silica contents with peraluminous characteristics and are enriched in light rare earth elements (LREEs), Rb, and Th-U and depleted in Ba, Nb-Ta, Sr and Eu. These samples have high whole-rock F (114-596 ppm) but low Cl (3.3-54.8 ppm) contents. Apatite minerals separated from the high-silica rhyolites are classified as fluorapatite and show F-rich (F > 3.56 wt%), Cl-poor (Cl < 0.02 wt%), low (La/Sm)N and high (Gd/Yb)N ratios, with a negative Eu anomaly. The high-silica rhyolites yield initial (87Sr/86Sr)i ratios of 0.70405 to 0.70789, negative whole-rock epsilon Nd(t) (-3.3 to -6.3), negative apatite epsilon Nd(t) (-5.2 to -6.6) and negative zircon epsilon Hf(t) values (-0.1 to -9.6). Our data suggest that their primary magma was derived from modified crustal sources that could contain a mixture of ancient and juvenile components, and it then evolved, was injected into a low-pressure magma chamber, and finally erupted with the release of volatiles at the magma chamber roof. We infer that SE China was mainly under a setting of lithospheric extension from the Early to early Late Cretaceous because of slab roll-back and steepening of the subducted Paleo-Pacific Plate. (c) 2020 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.