{"id":"74c83077-1913-499e-8ca8-cce6ff249af6","title":"藏南冈底斯带弧岩浆丰度的对比:来自侏罗纪火山岩地球化学变化的证据","title_en":"Contrasting arc magma fertilities in the Gangdese belt, Southern Tibet: Evidence from geochemical variations of Jurassic volcanic rocks","serial":"","user_limit":"为尊重知识产权、保障数据作者的权益、扩展数据中心的服务、评估数据的应用潜力，请数据使用者在使用数据所产生的研究成果中（包括公开发表的论文、论著、数据产品和未公开发表的研究报告、数据产品等成果），明确注明数据来源和数据作者。对于转载（二次或多次发布）的数据，作者还须注明原始数据来源。","instructions":"2019001.txt,代表2019年1月发表的由侏罗纪火山岩地球化学变化所得到的藏南冈底斯带弧岩浆丰度的对比。","description":"本数据为西藏南部的侏罗纪火山岩地球化学数据，包括含矿斑岩的主微量、锆石U-Pb定年、锆石微量元素、磷灰石主微量元素数据。数据来自冈底斯带一大型弧相关斑岩矿床(谢通门)。将新近发表的比马组资料与已发表的野坝组资料进行比较，了解它们与成矿的不同关系。比马组火山岩由玄武岩、安山岩和英安岩组成，均含锆石。使用单bondPb年龄为195.0 Ma - 165.1 Ma(新年龄为180.2 ± 0.8 ~ 166.7 ± 1.1 Ma)。玄武岩、中质岩和长英质岩的地球化学特征一致，Sr-Nd-Hf同位素特征相似(87Sr/86Sr)i = 0.703182 ~ 0.705489)；εNd (t) = 3.2到7.1；εHf(t) = 9.3 ~ 16.0)表明其形成于玄武岩岩浆的分离结晶。野坝组火山岩年龄范围相近(192.7 Ma ~ 168.0 Ma)，但组成范围较宽(从玄武岩到流纹岩)，Sr-Nd-Hf同位素组成((87Sr/86Sr)i = 0.700182 ~ 0.707723；εNd (t) = −5.1到4.5；ε高频(t) = −18.5到17.6)。\n与野坝组相比，比马组安山岩和英安岩样品具有较高的锆石Eu/Eu*、Ce4+/Ce3+和(Ce/Nd)/Y比值，锆石中钛的温度较低，表明比马组岩浆具有更强的氧化性和含水性，因此更有利于斑岩铜矿的形成。野坝组岩浆相对还原，形成于拉萨中部古基底附近的远端弧环境中。它们的演化同位素特征和还原性可能是由于更广泛的还原性地壳成分的污染而导致的，使它们不适于斑岩铜矿化。因此，冈底斯带弧相关斑岩型铜矿的勘探应集中在肥沃的比马组。","doi":"10.1016/j.lithos.2018.12.008","projection":"","language":"zh","share_type":"online","east":88.44,"west":88.38,"south":29.35,"north":29.41,"scale":null,"crs":null,"filesize":0.03,"share_policy":"a","ts_created":"2021-05-19T19:42:11.402193+08:00","doi_type":"沿用数据已有DOI","ts_updated":"2021-05-25T21:52:12.529657+08:00","time_description":"175.5百万年来","datas_group":3,"time_description_en":"Jurassic","data_format":null,"project":[11],"specials":[],"cite":null,"review_status":5,"review_invite":[{"user_name":"王浩","username":"王浩_iggcas","email":"wanghao@mail.iggcas.ac.cn","is_cancel_expert":false}],"review_editor":{"id":42421,"last_login":"2022-04-08T15:16:51.670544+08:00","username":"任慧霞","email":"510727846@qq.com","is_active":true,"is_staff":true,"user_name":"任慧霞"},"data_sources":null,"temporal_resolution":"1000 year < x","spatial_resolution":"100m - 1km","license":"Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)","fund":[521],"subtopics":{"metadata":"74c83077-1913-499e-8ca8-cce6ff249af6","three_pole":null,"third_pole":null},"username":"黄文婷","review_time":null,"protected_duration":null,"protected_describe":null,"is_important":false,"hit_count":286}