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东天山圪塔山口镁铁-超镁铁质岩体地球化学、锆石U-Pb年代学及其对Ni-Cu成矿的指示/Geochemistry and zircon U-Pb geochronology of Getashankou mafic-ultramafic intrusions, eastern Tianshan, and its implication for Ni-Cu mineralization[J]
Authors
FENG HongYe
GUO HaiBing
+16 more
MAO YaJing
QIN KeZhang
SAN JinZhu
TANG DongMei
XU YingXia
三金柱
中国科学院新疆矿产资源研究中心,中国科学院新疆生态与地理研究所,乌鲁木齐830011
中国科学院矿产资源研究重点实验室,中国科学院地质与地球物理研究所,北京100029
冯宏业
唐冬梅
新疆有色地勘局704队,哈密839000
毛亚晶
河北联合大学矿业工程学院地质系,唐山063009
秦克章
许英霞
郭海兵
Publication date
1 January 2014
Publisher
Abstract
新疆新近发现的圪塔山口镍铜硫化物矿床位于东天山康古尔-黄山镍铜硫化物成矿带的东端.矿区包含4个镁铁-超镁铁质岩体,其中Ⅰ、Ⅱ、Ⅲ号岩体均见镍铜硫化物矿化.本文利用SIMS锆石U-Pb法测得Ⅰ号矿化岩体辉长岩年龄为282.6±1.9Ma,不仅与东天山地区其它含Ni-Cu矿化的镁铁-超镁铁质岩体形成时代一致,而且与塔里木玄武岩、镁铁质岩墙及北山地区的镁铁-超镁铁质岩体形成时限相一致.其形成可能与造山后伸展背景下的地幔柱叠加作用有关.地球化学数据表明圪塔山口岩体具有高Mg特征,除2个辉长岩样品m/f值较低外,其余14个样品集中于2.73~ 5.05之间,属铁质超基性岩.岩石稀土元素配分模式为右倾式,轻、重稀土比2.64~3.39;含长角闪辉橄岩及部分含长角闪橄辉岩和含长橄辉岩δEu具正异常,可能与这3个岩相中存在斜长石的结晶有关.微量元素蛛网图表明岩石富集大离子亲石元素Cs、Rb、Ba、K、Sr,富集高场强元素U、Pb,亏损高场强元素Th、Nb等特征.主量元素SiO2-(Na2O +K2O)与(FeOT/MgO)-FeOT图解、微量元素相关图及微量元素比值相关图说明圪塔山口岩体成岩物质为来源于亏损地幔的钙碱性玄武质岩浆,成岩作用以岩浆结晶分异为主导,并受到地壳的混染作用,具有较好的镍铜硫化物矿床成矿潜力
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Last time updated on 29/11/2016