气候变化领域集成服务门户(CCPortal): Compositions and ages of Early Cretaceous volcanic and plutonic rocks in central Tibet: Insights into the magmatic and uplift response to slab breakoff

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DOI	10.1130/GES02586.1
	Compositions and ages of Early Cretaceous volcanic and plutonic rocks in central Tibet: Insights into the magmatic and uplift response to slab breakoff
	Wu, Hao; Liu, Fei; Liu, Xi-Jun; Wu, Yan-Wang; Li, Cai; Yang, Rui
发表日期	2023
ISSN	1553-040X
起始页码	583
结束页码	598
卷号	19 期号:2
英文摘要	We present new zircon U-Pb ages and Hf isotope compositions as well as whole- rock major- and traceelement geochemical and Sr- Nd isotopic data for silicic plutonic and volcanic rocks from the Duolong area of central Tibet. Combined with existing data, our new data indicate that these plutonic and volcanic rocks were formed in two stages ca. 120 Ma and ca. 110 Ma, respectively, in a postcollisional extensional setting that was triggered by slab breakoff. The similar geochemical compositions of granitoids and rhyolites, combined with their close spatial and temporal relationships, suggest that they were both derived from juvenile crustal material within a single magmatic system. We propose that the two inferred crustal melting events in the Duolong area were caused by two episodes of deep mantle activity triggered by the transition of the plate subduction angle from steep to shallow in response to the ascent of buoyant continental lithosphere during slab breakoff. Furthermore, rapid surface uplift during the late Early Cretaceous caused by slab breakoff made an important contribution to the formation of the proto- Tibetan Plateau. This study provides new insights into postcollisional tectonomagmatism and plateau uplift in central Tibet triggered by slab breakoff. We propose more generally that tectonic uplift during postcollisional processes (i.e., slab breakoff and lithospheric delamination) is a major contributor to plateau uplift in collision zones.
英文关键词	CU-AU DEPOSIT; PORPHYRY COPPER-DEPOSIT; U-PB GEOCHRONOLOGY; LHASA TERRANE; HF ISOTOPE; GEOLOGICAL EVOLUTION; TEMPORAL VARIATIONS; TECTONIC EVOLUTION; QIANGTANG TERRANE; METALLOGENIC BELT
WOS研究方向	Geosciences, Multidisciplinary
WOS记录号	WOS:000959905600011
来源期刊	GEOSPHERE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283152
作者单位	Guilin University of Technology; Jilin University; Tianjin Chengjian University; Guilin University of Technology
推荐引用方式 GB/T 7714	Wu, Hao,Liu, Fei,Liu, Xi-Jun,et al. Compositions and ages of Early Cretaceous volcanic and plutonic rocks in central Tibet: Insights into the magmatic and uplift response to slab breakoff[J],2023,19(2).
APA	Wu, Hao,Liu, Fei,Liu, Xi-Jun,Wu, Yan-Wang,Li, Cai,&Yang, Rui.(2023).Compositions and ages of Early Cretaceous volcanic and plutonic rocks in central Tibet: Insights into the magmatic and uplift response to slab breakoff.GEOSPHERE,19(2).
MLA	Wu, Hao,et al."Compositions and ages of Early Cretaceous volcanic and plutonic rocks in central Tibet: Insights into the magmatic and uplift response to slab breakoff".GEOSPHERE 19.2(2023).