- 责任者：Liu Bin (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Wuhan 430074 ; China) ; Ma Changqian
- 刊名：Earth Science
- 出版年：2013
- 卷期：38(5)
- 关键词：A型花岗岩 ; A-type granite ; 昆仑山 ; Kunlun Mountains
- 页码：p.947-962
- 图表：9 illus., 2 tables, 63 refs.
- 分类号：0801
- issnNo：ISSN1000-2383
- isbnNo：CN42-1233/P
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man">Middle Devonian Binggou granites from the eastern Kunlun orogen,are characterized by relatively high siliconman’; mso-hansi-font-family: ’times new roman’">（man">SiO2 =71.85%-72.77%man’; mso-hansi-font-family: ’times new roman’">）man">,total alkaliman’; mso-hansi-font-family: ’times new roman’">（man">K2 Oman’; mso-hansi-font-family: ’times new roman’">＋man">Na2 O=8.39-8.58man’; mso-hansi-font-family: ’times new roman’">）man">,aluminumman’; mso-hansi-font-family: ’times new roman’">（man">A/CNK=0.93-1.03man’; mso-hansi-font-family: ’times new roman’">）man">,FeOt /MgOman’; mso-hansi-font-family: ’times new roman’">（man">6.247.86man’; mso-hansi-font-family: ’times new roman’">）man">and 104 Ga/Al valuesman’; mso-hansi-font-family: ’times new roman’">（man">3.04-3.60man’; mso-hansi-font-family: ’times new roman’">）man">,high LREE,obvious negative Eu anomalies,and notable enrichment of HFSEman’; mso-hansi-font-family: ’times new roman’">（man">Zr,Ga,Y,Hf,etc.man’; mso-hansi-font-family: ’times new roman’">）man">,strong depletion of Ba,Sr,P and Ti relative to the primitive mantle,similar to the geochemical features of A-type granites.The LA-ICP-MS Zircon U-Pb analyses yield a weighted mean 206Pb/238 U age of 391man’; mso-hansi-font-family: ’times new roman’">±man">3Maman’; mso-hansi-font-family: ’times new roman’">（man">MSWD=2.36man’; mso-hansi-font-family: ’times new roman’">）man">,considered to be the formation age of the Binggou granites.With a comprehensive consideration on many different indexes,such as whole rock Sr-Nd isotopes,geochemistry,experimental petrology and so on,we conclude that the Binggou granites formed by partial melting of crust materialsman’; mso-hansi-font-family: ’times new roman’">（man">meta-greywackeman’; mso-hansi-font-family: ’times new roman’">）man">on the conditions of low pressure and high temperature at the stage of postorogenic stretch.The Binggou granites are younger than the other Paleozoic A-type granites reported in the eastern Kunlun orogen,suggesting the ending proto-tethys and the beginning paleo-tethys.