Petrogenesis of the Devonian high-Mg rock association and its tectonic implication for the Chinese Altai orogenic belt, NW China

doi:10.1016/j.jseaes.2015.02.014

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Petrogenesis of the Devonian high-Mg rock association and its tectonic implication for the Chinese Altai orogenic belt, NW China
	He, Yulin 1; Sun, Min 1; Cai, Keda 2; Xiao, Wenjiao 2,3; Zhao, Guochun 1; Long, Xiaoping 4; Li, Pengfei 1
刊名	JOURNAL OF ASIAN EARTH SCIENCES
	2015-12-01
卷号	113 页码:61-74
关键词	High Mg igneous association Subduction-accretion Paleozoic magmatism Chinese Altai CAOB
DOI	10.1016/j.jseaes.2015.02.014
文献子类	Article
英文摘要	The Chinese Altai is a key region to decipher the accretionary history of the gigantic CAOB, one of the largest accretionary orogenic belts on the earth. However, tectonic implication of the widely distributed Paleozoic magmatic rocks remain debated. In this study, a suite of igneous rocks, including high Mg dacite of the Kangbutiebao Formation and the associated gneissic granodiorites, have been studied for their petrogenesis and tectonic implication. The high Mg dacite is dated at 400 +/- 2 Ma, which broadly resembles the emplacement age of the high Mg gneissic granodiorites of 406 +/- 9 Ma, possibly suggesting that they were generated in the same tectono-magmatic event. Both rocks have predominant zircon inheritances of similar to 500 Ma, which is consistent with the age of predominant zircon population for the widespread Habahe sedimentary sequence, indicating that their precursor magmas were probably mainly derived from the Habahe sediments. The high-Mg rock association has similar REE and trace element patterns to those of the Habahe sediments and they plot close to the field of the Habahe sediments in Th/Ta versus La/Ta diagram. Their high A/CNK ratios (1.33-2.05) imply, magma source dominated by sedimentary rocks. Similarly, their high La/Sm ratios also suggest a greater contribution of sediments rather than altered oceanic crust in the magma generation. However, the high Mg# values (similar to 51) of the studied rocks argue against derivation purely from remelting of the Habahe sediments. In order to explain the high Mg# values of these rocks, the participation of mantle-derived melt into the precursor magma is considered. Zircons from this rock association mostly yield epsilon(Hf)(t) values from +0.85 to +9.71, supporting the involvement of juvenile materials in the magma generation. Samples from the high Mg rock association fall in the same field as the sanukitoids in TiO2 versus Mg# and Sr/Y versus Y diagrams, and they plot in the fractional crystallization trend of differentiated sanukitoids in Harker diagram, possibly suggesting a petrogenetic process like the typical sanukitoid magma elsewhere. This study shows that similar to the sanukitoids in the Setouchi area, our high Mg rock association also involved melting of subducted sediments in a hot subduction regime. Combined with previous work, a ridge subduction regime is considered to interpret the early Devonian tectonic evolution of the Chinese Altai. (c) 2015 Elsevier Ltd. All rights reserved.
WOS关键词	SETOUCHI VOLCANIC BELT ; BONINITE SERIES VOLCANICS ; ZIRCON U-PB ; MAGNESIAN ANDESITES ; NORTHERN XINJIANG ; BAJA-CALIFORNIA ; CONTINENTAL-CRUST ; NORTHWEST CHINA ; ACCRETIONARY OROGENESIS ; ASTHENOSPHERIC WINDOW
WOS研究方向	Geology
语种	英语
WOS记录号	WOS:000367406200006
资助机构	Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000 ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000 ; Hong Kong Research Grant Council(HKU704013P ; Hong Kong Research Grant Council(HKU704013P ; National Science Foundation of China(41273048) ; National Science Foundation of China(41273048) ; Xinjiang Outstanding Youth Scientific Grant(2013711003) ; Xinjiang Outstanding Youth Scientific Grant(2013711003) ; CRCG grant from HKU(201209176180) ; CRCG grant from HKU(201209176180) ; HKU(SKLIG-KF-12-03 ; HKU(SKLIG-KF-12-03 ; GIGCAS(SKLIG-KF-12-03 ; GIGCAS(SKLIG-KF-12-03 ; 2014CB440801) ; 2014CB440801) ; HKU704712P) ; HKU704712P) ; SKLIG-KF-13-01) ; SKLIG-KF-13-01) ; SKLIG-KF-13-01) ; SKLIG-KF-13-01) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000 ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000 ; Hong Kong Research Grant Council(HKU704013P ; Hong Kong Research Grant Council(HKU704013P ; National Science Foundation of China(41273048) ; National Science Foundation of China(41273048) ; Xinjiang Outstanding Youth Scientific Grant(2013711003) ; Xinjiang Outstanding Youth Scientific Grant(2013711003) ; CRCG grant from HKU(201209176180) ; CRCG grant from HKU(201209176180) ; HKU(SKLIG-KF-12-03 ; HKU(SKLIG-KF-12-03 ; GIGCAS(SKLIG-KF-12-03 ; GIGCAS(SKLIG-KF-12-03 ; 2014CB440801) ; 2014CB440801) ; HKU704712P) ; HKU704712P) ; SKLIG-KF-13-01) ; SKLIG-KF-13-01) ; SKLIG-KF-13-01) ; SKLIG-KF-13-01)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/62133]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
作者单位	1.Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China 2.Chinese Acad Sci, Xinjiang Res Ctr Mineral Resources, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China 3.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China 4.Chinese Acad Sci, Key Lab Isotope Geochronol & Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	He, Yulin,Sun, Min,Cai, Keda,et al. Petrogenesis of the Devonian high-Mg rock association and its tectonic implication for the Chinese Altai orogenic belt, NW China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2015,113:61-74.
APA	He, Yulin.,Sun, Min.,Cai, Keda.,Xiao, Wenjiao.,Zhao, Guochun.,...&Li, Pengfei.(2015).Petrogenesis of the Devonian high-Mg rock association and its tectonic implication for the Chinese Altai orogenic belt, NW China.JOURNAL OF ASIAN EARTH SCIENCES,113,61-74.
MLA	He, Yulin,et al."Petrogenesis of the Devonian high-Mg rock association and its tectonic implication for the Chinese Altai orogenic belt, NW China".JOURNAL OF ASIAN EARTH SCIENCES 113(2015):61-74.