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

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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, LS (Zeng LingSen); Chen, J (Chen Jing); Chen, ZY (Chen ZhenYu); Liu, J (Liu Jing); Liang, FH (Liang FengHua); Gao, L (Gao Lie)
刊名	ACTA PETROLOGICA SINICA
	2007
卷号	23 期号:12 页码:3171-3179
关键词	Sulu UHP rocks Shidao granitic complex Al-in-homblende geobarometer rapid exhumation
ISSN号	1000-0569
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.
学科主题	火成岩岩石学
WOS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
WOS研究方向	Geology
语种	中文
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000254582000009
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38515]
专题	中国地质调查局
作者单位	Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100085, Peoples R China
推荐引用方式 GB/T 7714	Zeng, LS ,Chen, J ,Chen, ZY ,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]. ACTA PETROLOGICA SINICA,2007,23(12):3171-3179.
APA	Zeng, LS ,Chen, J ,Chen, ZY ,Liu, J ,Liang, FH ,&Gao, L .(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),3171-3179.
MLA	Zeng, LS ,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):3171-3179.