气候变化领域集成服务门户(CCPortal): The Tethyan Himalaya Igneous Province: Early Melting Products of the Kerguelen Mantle Plume

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DOI	10.1093/petrology/egab069
	The Tethyan Himalaya Igneous Province: Early Melting Products of the Kerguelen Mantle Plume
	Chen, Sheng-Sheng; Fan, Wei-Ming; Shi, Ren-Deng; Xu, Ji-Feng; Liu, Yong-Min
通讯作者	Chen, SS (通讯作者)
发表日期	2021
ISSN	0022-3530
EISSN	1460-2415
卷号	62 期号:11
英文摘要	The Kerguelen large igneous province (LIP) has been related to mantle plume activity since at least 120 Ma. There are some older (147-130 Ma) magmatic provinces on circum-eastern Gondwana, but the relationship between these provinces and the Kerguelen mantle plume remains controversial. Here we present petrological, geochronological, geochemical, and Sr-Nd-Hf-Pb-Os isotopic data for high-Ti mafic rocks from two localities (Cuona and Jiangzi) in the eastern Tethyan Himalaya igneous province (147-130 Ma). Zircon grains from these two localities yielded concordant weighted mean (206)pb/U-238 ages of 137.25 +/- 0.98 Ma and 131.28 +/- 0.78 Ma (2 sigma), respectively. The analyzed mafic rocks are enriched in high field strength elements and have positive Nb-Ta anomalies relative to Th and La, which have ocean island basalt-like characteristics. The Cuona basalts were generated by low degrees of melting (3-5 %) of garnet Iherzolites (3-5 vol% garnet), and elsewhere the Jiangzi diabases were formed by relatively lower degrees of melting (1-3%) of garnet Iherzolite (1-5 vol% garnet). The highly radiogenic Os and Pb isotopic compositions of the Jiangzi diabases were produced by crustal contamination, but the Cuona basalts experienced the least crustal contamination given their relatively low gamma Os(t), (206)pb/(204)pb(i), (207)pb/(204)pb(i), and (208)pb/(204)pb(i) values. Major and trace element geochemical and Sr-Nd-Hf-Pb-Os isotope data for the Cuona basalts are similar to those for products of the Kerguelen mantle plume head. Together with high mantle potential temperatures (>1500 degrees C), this suggests that the eastern Tethyan Himalaya igneous province (147-130 Ma) was an early magmatic product of the Kerguelen plume. A mantle plume initiation model can explain the temporal and spatial evolution of the Kerguelen LIP, and precontinental breakup played a role in the breakup of eastern Gondwana, given the >10 Myr between initial mantle plume activity (147-130 Ma) and continental breakup (132-130 Ma). Like studies of Re-Os isotopes in other LIPs, the increasing amount of crustal assimilation with distance from the plume stem can explain the variations in radiogenic Os.
关键词	HIGHLY SIDEROPHILE ELEMENT OS ISOTOPE SYSTEMATICS CONTINENTAL FLOOD BASALTS PLASMA-MASS SPECTROMETRY TRACE-ELEMENT INDIAN-OCEAN LU-HF ARCHIPELAGO BASALTS VOLCANIC-ROCKS U-PB
英文关键词	large igneous province; Early Cretaceous; Kerguelen mantle plume; Eastern Gondwana; Sr-Nd -Hf -Pb -Os isotopes
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000745050100014
来源期刊	JOURNAL OF PETROLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260229
推荐引用方式 GB/T 7714	Chen, Sheng-Sheng,Fan, Wei-Ming,Shi, Ren-Deng,et al. The Tethyan Himalaya Igneous Province: Early Melting Products of the Kerguelen Mantle Plume[J]. 中国科学院青藏高原研究所,2021,62(11).
APA	Chen, Sheng-Sheng,Fan, Wei-Ming,Shi, Ren-Deng,Xu, Ji-Feng,&Liu, Yong-Min.(2021).The Tethyan Himalaya Igneous Province: Early Melting Products of the Kerguelen Mantle Plume.JOURNAL OF PETROLOGY,62(11).
MLA	Chen, Sheng-Sheng,et al."The Tethyan Himalaya Igneous Province: Early Melting Products of the Kerguelen Mantle Plume".JOURNAL OF PETROLOGY 62.11(2021).