Ages of the Hongshan granite and intruding dioritic dyke swarms, in;western Junggar, Xinjiang, NW China: Evidence form LA-ICP-MS zircon;chronology

	Ages of the Hongshan granite and intruding dioritic dyke swarms, in;western Junggar, Xinjiang, NW China: Evidence form LA-ICP-MS zircon;chronology
	Feng QianWen; Li JinYi; Liu JianFeng; Zhang Jin; Qu JunFeng
刊名	ACTA PETROLOGICA SINICA
	2012
卷号	28 期号:9 页码:2935-2949
关键词	Hongshan granite Dykes LA-ICP-MS Zircon U-Pb chronology Western Junggar
ISSN号	022HC
英文摘要	Dykes preserve important information which indicates the magma intrusion history and geodynamical environment. In order to reconstruct the Late Paleozoic geodynamical conditions of western Junggar and Central Asia, the large number of dark dioritic dykes, emplaced in Hongshan granitic pluton, in western Junggar, were studied by remote sensing interpretation, field investigation and sample analysis. It is revealed that there are two groups of dykes, namely the ring dykes and the non-ring dykes, emplaced in Hongshan granitic pluton. From the ring centre to margin the thickness and grain size of the ring dykes decrease gradually. The non-ring dykes, without obvious variety in thickness and grain size, cut the ring dykes at many outcrops. The zircon Pb-206/U-238 ages of the ring dykes, the non-ring dykes and the host rock were obtained, by LA-ICP-MS zircon U-Pb dating, including 3 samples from the ring dykes, 2 samples from the non-ring dykes and 1 sample from the host rock were analyzed. Their ages are 304 +/- 1Ma, 302 +/- 1Ma and 303 +/- 1Ma for the ring dykes, 302 +/- 1Ma and 302 +/- 1Ma for the non-ring dykes, and 304 +/- 1Ma for the host rock. Considering these chronology data and the contact relationships among the ring dykes, the non-ring dykes and the host rock, the host rock was formed at 304Ma, the ring dykes are formed at 303Ma, and the non-ring dykes are formed at 302Ma, approximately. These chronology data imply that there were different kinds of magma intrusions in western Junggar and the fractures filled by later dioritic magma were formed in Late Carboniferous, and provide reliable time constrains for further study of Late Paleozoic geodynamical conditions in western Junggar and Central Asia.
学科主题	火成岩岩石学
WOS关键词	NORTHERN XINJIANG ; OPHIOLITIC MELANGE ; MAFIC DYKES ; SUBDUCTION ; BASIN ; GEOCHRONOLOGY ; FRAMEWORK ; REGIONS ; GROWTH ; CRUST
WOS研究方向	Geology
语种	中文
WOS记录号	WOS:000309947500021
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/39842]
专题	中国地质科学院地质研究所
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Feng QianWen,Li JinYi,Liu JianFeng,et al. Ages of the Hongshan granite and intruding dioritic dyke swarms, in;western Junggar, Xinjiang, NW China: Evidence form LA-ICP-MS zircon;chronology[J]. ACTA PETROLOGICA SINICA,2012,28(9):2935-2949.
APA	Feng QianWen,Li JinYi,Liu JianFeng,Zhang Jin,&Qu JunFeng.(2012).Ages of the Hongshan granite and intruding dioritic dyke swarms, in;western Junggar, Xinjiang, NW China: Evidence form LA-ICP-MS zircon;chronology.ACTA PETROLOGICA SINICA,28(9),2935-2949.
MLA	Feng QianWen,et al."Ages of the Hongshan granite and intruding dioritic dyke swarms, in;western Junggar, Xinjiang, NW China: Evidence form LA-ICP-MS zircon;chronology".ACTA PETROLOGICA SINICA 28.9(2012):2935-2949.