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	Emplacement depth of the Shidao granitic complex and the rapid exhumation of the Sulu ultrahigh pressure rocks: New constraints on the mechanisms for rapid exhumation
	Zeng LingSen; Chen Jing; Chen ZhenYu; Liu Jing; Liang FengHua; Gao Lie
发表日期	2007
ISSN	1000-0569
起始页码	3171
结束页码	3179
卷号	23 期号:12 页码:94-100
英文摘要	The Shidao potassic granitic complex, consisting of pyroxene syenite, quartz syenite, and potassic granite in the order of intrusion sequence, intruded into the northeastern Sulu ultrahigh pressure (UHP) metamorphic rocks at 225 to 205Ma. The Sulu UHP rocks were at UHP conditions (P > 3.1 GPa) around 229Ma or later. The Shidao syenite contains a mineral assemblage appropriate to use the aluminum-in-homblende geobarometer to constrain its emplacement depth at similar to 215Ma. Our data show that the Shidao syenite was at a depth of similar to 15km, which in turn indicates that the northeastern Sulu UHP rocks were already at a depth less than 15km when the Shidao syenite emplaced and consolidation at similar to 215Ma. Taking the depth difference for the Sulu UHP rocks at similar to 229Ma and similar to 215Ma, respectively, a minimum exhumation rate of 5.0mm/yr was inferred. Such a high exhumation rate significantly exceeds erosion driven denudation and requires a catatrophic mechanism to abruptly release the subducting Sulu continental slab and generate driving forces to push the Sulu UHP rocks back to the shallow level of a continental lithosphere at a relatively short period of time. This is consistent with the slab break-off model which can account for the rapid exhumation of subducting continental material as well as the formation of potassic rocks. Break-off of the subducting Sulu continental slab may also trigger the large-scale upwelling of asthenosphere and eventually lead to the Mesozoic thinning and extension of the North China Craton.
关键词	ZIRCON U-PB EMPIRICAL IGNEOUS GEOBAROMETER RETROGRADE METAMORPHIC AGES SCIENTIFIC DRILLING PROJECT IN-HORNBLENDE BAROMETER SR ISOTOPIC EVIDENCE EASTERN CHINA DABIE MOUNTAINS SM-ND EXPERIMENTAL CALIBRATION
英文关键词	Sulu UHP rocks; Shidao granitic complex; Al-in-homblende geobarometer; rapid exhumation
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000254582000009
来源期刊	ACTA PETROLOGICA SINICA
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/55724
推荐引用方式 GB/T 7714	Zeng LingSen,Chen Jing,Chen ZhenYu,et al. Emplacement depth of the Shidao granitic complex and the rapid exhumation of the Sulu ultrahigh pressure rocks: New constraints on the mechanisms for rapid exhumation[J]. 中国科学院青藏高原研究所,2007,23(12):94-100.
APA	Zeng LingSen,Chen Jing,Chen ZhenYu,Liu Jing,Liang FengHua,&Gao Lie.(2007).Emplacement depth of the Shidao granitic complex and the rapid exhumation of the Sulu ultrahigh pressure rocks: New constraints on the mechanisms for rapid exhumation.ACTA PETROLOGICA SINICA,23(12),94-100.
MLA	Zeng LingSen,et al."Emplacement depth of the Shidao granitic complex and the rapid exhumation of the Sulu ultrahigh pressure rocks: New constraints on the mechanisms for rapid exhumation".ACTA PETROLOGICA SINICA 23.12(2007):94-100.