Factors controlling the geochemical differences between two types of rhyolites in the middle Okinawa Trough

doi:10.1007/s12303-018-0084-2

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Factors controlling the geochemical differences between two types of rhyolites in the middle Okinawa Trough
	Zhang, Yuxiang 2,3; Zeng, Zhigang 1,2,3; Wang, Xiaoyuan 1,2; Chen, Shuai 2; Yin, Xuebo 2
刊名	GEOSCIENCES JOURNAL
	2020-02-01
卷号	24 期号:1 页码:35-48
关键词	Okinawa Trough rhyolite amphibole crustal contamination magmatic differentiation
ISSN号	1226-4806
DOI	10.1007/s12303-018-0084-2
通讯作者	Zeng, Zhigang(zgzeng@qdio.ac.cn)
英文摘要	The origin of the felsic volcanic rocks in the Okinawa Trough (OT) remains uncertain. In the middle Okinawa Trough (MOT), two types of rhyolites (type 1 and type 2 rhyolites) have been recognized. Research on the diverse volcanic rocks should be prioritized to determine the magmatic origins of these rocks. Consequently, in this article, the geochemical differences and controlling factors for these two types of MOT rhyolites are systematically discussed. Type 2 rhyolites have higher Dy/Yb and Nb/Ta ratios than type 1 rhyolites, implying that the former might be influenced by a greater contribution of amphibole. Quantitative models suggest that type 1 rhyolites could have formed via the remelting of andesites when amphiboles remain in the source, whereas type 2 rhyolites could have formed without residual amphiboles. These two distinct melting models effectively explain most discrepancies between the major and trace element compositions of type 1 and 2 rhyolites. Additionally, the lower Mg# and delta Eu values of type 2 rhyolites are partly caused by significant magmatic differentiation. Quasi-linear correlations between some major oxides, trace element ratios and Sr-Nd isotopic ratios for type 2 rhyolites suggest that these rhyolites might have been contaminated by crustal rocks or melts with compositions similar to those of the Kueishantao (KST) andesites or the Middle Miocene upper crustal rocks of SW Japan. Therefore, isotopically enriched crustal materials likely remain in the OT crust.
资助项目	National Natural Science Foundation of China[41325021] ; National Natural Science Foundation of China[41306053] ; National Natural Science Foundation of China[41476044] ; National Natural Science Foundation of China[41706052] ; National Basic Research Program of China[2013CB429700] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA11030302] ; International Partnership Program of Chinese Academy of Sciences[133137KYSB20170003] ; Special Fund for the Taishan Scholar Program of Shandong Province[ts201511061] ; AoShan Talents Program by Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; AoShan Talents Program by Qingdao National Laboratory for Marine Science and Technology[2016ASKJ13] ; AoShan Talents Program by Qingdao National Laboratory for Marine Science and Technology[2015ASTP-0S17] ; Innovative Talent Promotion Program[2012RA2191] ; Science and Technology Development Program of Shandong Province[2013GRC31502] ; National High Level Talent Special Support Program
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOCIETY KOREA
WOS记录号	WOS:000511879100003
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/165268]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Zeng, Zhigang
作者单位	1.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266071, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Seafloor Hydrothermal Act Lab, 7 Nanhai Rd, Qingdao 266071, Shandong, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Yuxiang,Zeng, Zhigang,Wang, Xiaoyuan,et al. Factors controlling the geochemical differences between two types of rhyolites in the middle Okinawa Trough[J]. GEOSCIENCES JOURNAL,2020,24(1):35-48.
APA	Zhang, Yuxiang,Zeng, Zhigang,Wang, Xiaoyuan,Chen, Shuai,&Yin, Xuebo.(2020).Factors controlling the geochemical differences between two types of rhyolites in the middle Okinawa Trough.GEOSCIENCES JOURNAL,24(1),35-48.
MLA	Zhang, Yuxiang,et al."Factors controlling the geochemical differences between two types of rhyolites in the middle Okinawa Trough".GEOSCIENCES JOURNAL 24.1(2020):35-48.