气候变化领域集成服务门户(CCPortal): Causes and Consequences of Wehrlitization Beneath a Trans-Lithospheric Fault: Evidence From Mesozoic Basalt-Borne Wehrlite Xenoliths From the Tan-Lu Fault Belt, North China Craton

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DOI	10.1029/2019JB019084
	Causes and Consequences of Wehrlitization Beneath a Trans-Lithospheric Fault: Evidence From Mesozoic Basalt-Borne Wehrlite Xenoliths From the Tan-Lu Fault Belt, North China Craton
	Lin A.-B.; Zheng J.-P.; Aulbach S.; Xiong Q.; Pan S.-K.; Gerdes A.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	Trans-lithospheric faults represent weak zones where some of the most intense interaction between the lithospheric mantle and melts occurs. We carried out detailed petrological observations and mineral chemical analyses of feldspar-bearing wehrlites entrained in the Mesozoic basalts from Liaoyuan, northeastern North China Craton (NCC) to obtain new insights into the nature and consequences of wehrlitization. Wehrlites (n = 12) show textural evidence for replacement of orthopyroxene by clinopyroxene, combined with low Ti/Eu (692–4,425) and variable, though generally high, Ca/Al, (La/Yb)N, and Zr/Hf in clinopyroxenes. This is ascribed to interaction with a silica-undersaturated, carbonated silicate melt. Feldspar with variable K2O (0.17–9.84 wt.%) and CaO (0.03–12.8 wt.%) and some clinopyroxene likely formed by decomposition of amphibole and mica during heating prior to entrainment. Integrated with data from peridotite xenoliths in Cenozoic basalts along the Tan-Lu fault belt (TLFB), these observations indicate deep volatile-rich melt metasomatism. This may have occurred during a known Late Cretaceous to Early Tertiary extensional stage and was precursory to basaltic magmatism in the north-south direction along the TLFB. We suggest that wehrlitization beneath the TLFB—and elsewhere—monitors the passage and mobility of carbonated melts linked to lithospheric thinning up to decratonization. Upward transport of the wehrlitizing carbonated melts through the massive TLFB and ultimate degassing of CO2 at the surface during its extensional stage may have contributed to the mid-Cretaceous greenhouse climate. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	mantle metasomatism; North China Craton; small-volume melts; trans-lithospheric fault; wehrlitization
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187785
作者单位	School of Earth Sciences, State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, China; Goethe-Universität, Institut für Geowissenschaften, Frankfurt, Germany; Frankfurt Isotope and Element Research Center (FIERCE), Goethe-Universität Frankfurt, Frankfurt, Germany; State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan, China; Gemological Institute, China University of Geosciences, Wuhan, China
推荐引用方式 GB/T 7714	Lin A.-B.,Zheng J.-P.,Aulbach S.,et al. Causes and Consequences of Wehrlitization Beneath a Trans-Lithospheric Fault: Evidence From Mesozoic Basalt-Borne Wehrlite Xenoliths From the Tan-Lu Fault Belt, North China Craton[J],2020,125(7).
APA	Lin A.-B.,Zheng J.-P.,Aulbach S.,Xiong Q.,Pan S.-K.,&Gerdes A..(2020).Causes and Consequences of Wehrlitization Beneath a Trans-Lithospheric Fault: Evidence From Mesozoic Basalt-Borne Wehrlite Xenoliths From the Tan-Lu Fault Belt, North China Craton.Journal of Geophysical Research: Solid Earth,125(7).
MLA	Lin A.-B.,et al."Causes and Consequences of Wehrlitization Beneath a Trans-Lithospheric Fault: Evidence From Mesozoic Basalt-Borne Wehrlite Xenoliths From the Tan-Lu Fault Belt, North China Craton".Journal of Geophysical Research: Solid Earth 125.7(2020).