地质学报2017，Vol.91Issue(8)：1796-1817,22.
福建河田高分异花岗岩的矿物和全岩地球化学找矿标志研究
Highly Fractionated Grantitic Minerals and Whole-rock Geochemistry Prospecting Markers in Hetian, Fujian Province
摘要
Abstract
South China is an important polymetallic metallogenic region for tungsten,tin,molybdenum,bismuth,uranium,lead,zinc,and rare earth elements.Recently available chronological data demonstrate that the aforementioned mineral resources occurred intensively in the Late Jurassic (165～150 Ma).Field and experimental observations indicate that these granites can be divided into three series based on degrees of differentiation and fractionation:low fractionated,highly fractionated,and cumulus crystal granites.Existing research results have shown that metallogenesis of W,Sn,Nb,Ta,Li and B,etc are closely related to highly fractionated granite.Therefore,marker establishment of mineral and whole rock geochemistry of these deposits related to highly fractionated granite will be conductive to understanding the mineralization potential in heavily vegetation-covered and strongly weathered areas as well as poorly investigated rock masses.Hetain granitic pluton in Changting county of Fujian province is poorly exposed,with most under the thick weathered layer and covered by thick vegetation.But the several prospects of Sn,W,Pb and Zn have been discovered occurring in the rock masses.This study shows that the zircon U-Pb age,garnet and whole-rock geochemical features of the Hetian pluton are highly similar to those of the second-stage granite in Xihuashan of Jiangxi province.It can be inferred that the Hetian rock mass is of metallogenetic potential for W and Sn super-large ore deposits.In addition,during the continuous evolution process of granite into high fractionation stage,some elements ratios (such as Rb/Sr,Zr/Hf,and Nb) can be used as parameters to weight degree of crystallization fractionation.When melts reach to interaction stage of melt and fluid,the whole-rock zircon content and Zr/Hf ratio of the Xihuashan and Hetian granitic masses will change at Zr=50× 10 6 and Zr/Hf=15.Meanwhile,compared with garnet in poorly metallgoenic granite,Sn,Y and Yb contents in metallogenic granite increase distinctly,likely two to ten times higher.Therefore,trace elements features of the garnet from the highly fractionated granite can likely serve as one of the key prospecting markers.关键词
高分异花岗岩/石榴子石/Zr/Hf比值/找矿标志/华南/福建河田花岗岩体/江西西华山花岗岩体Key words
Highly fractionated granites/garnet/Zr/Hf ratio/prospecting markers/South China/Hetian granitic pluton in Fujian Province/Xihuashan granitic pluton in Jiangxi Province引用本文复制引用
郭春丽,曾令森,高利娥,苏红中,马星华,尹冰..福建河田高分异花岗岩的矿物和全岩地球化学找矿标志研究[J].地质学报,2017,91(8):1796-1817,22.基金项目
本文为国家自然科学面上基金项目(编号:41273043,41425010)、地质调查项目(编号:DD20160056)和国家重点研发计划课题(编号:2016YFC06002008)资助的成果. （编号:41273043,41425010）
