地质学报2013，Vol.87Issue(7)：931-942,12.
扬子克拉通西缘1.73 Ga非造山型花岗斑岩的发现及其地质意义
Discovery of the 1.73 Ga Haizi Anorogenic Type Granite in the Western Margin of Yantze Craton, and Its Geological Significance
摘要
Abstract
The late Paleoproterozoic Haizi plagioclase granite porphyry was discovered for the first time in the western margin of the Yangtze Craton.The paper reported that the LA-ICP-MS zircon U-Pb age is 1730±15 Ma(MSWD=4.0).The granite is characterized by high SiO2,ALK and low K2O/Na2O (SiO2 =69.77％～73.83％,AlK (K2O+Na2O) =5.46～6.65 and K2O/Na2O=0.02～0.14),Rittman index a=1.04～1.65,A/CNK=1.11～1.25 with an average of 1.18 (＞1.1),10000Ga/Al=3.96～7.34 (the average is 5.18＞2.6),high Fe number (FeO/(FeO+MgO) =0.95～0.99),suggesting the characters of low-K and calc-alkaline SP A-type granites.The granites are rich in high strength field elements (Nb,Ta,Zr,Hf),and obvious depletion of large ion lithophile elements (K,Sr,Ba),The gross amount of REE is 390.70× 10-6 ～674.91× 10 6,LREE/HREE=1.74～3.29 (the average is 2.18),the LREE is rich and have distinct fractionation; the REE shows significant negative Eu anomaly.The petrochemical and trace elements shows that the granite was formed in an intraplate extension environment,and its formation can be related to the magma underplating of the same period basipetalous igneous activities.The dating and geochemistry of Haizi granite porphyry represents that there exist the pattern of bimodel magmatic rocks in late Paleoproterozoic which is the same period as the global Columbia supercontinent Cracking event.关键词
锆石U-Pb测年/非造山型花岗岩/Columbia超大陆/海孜/武定Key words
U-Pb dating for zircons/ anorogenic type granite granite/ Columbia supercontinent/ Haizi,Wuding引用本文复制引用
王子正,郭阳,杨斌,王生伟,孙晓明,侯林,周邦国,廖震文..扬子克拉通西缘1.73 Ga非造山型花岗斑岩的发现及其地质意义[J].地质学报,2013,87(7):931-942,12.基金项目
本文为国土资源大调查项目(编号1212011120640 （）
1212010911064 （）
1212010813066)、国家重点基础研究发展规划"973"项目(编号2009CB421006)和国家自然科学基金项目(编号40830425、40173025)联合资助成果. （编号2009CB421006）
