{"id":"8070377b-0389-48fc-b2c0-c42408a5dbf7","title":"秦岭造山带高Sr/Y岩石的成因","title_en":"Genesis of the high Sr/Y rocks in the Qinling orogenic belt, central China","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":"2018008.txt，代表2018年8月发表的有关秦岭造山带高Sr/Y岩石的成因。","description":"高sr /Y岩石的成因及其与特定地球动力学背景的联系尚不明确。秦岭造山带广泛分布着高Sr/Y比值的三叠纪花岗岩侵入体。西秦岭造山带花岗闪长岩、花岗斑岩和英安岩3个侵入体的锆石LA-ICP-MS U-Pb年龄为237 ~ 216 Ma。岩石的特征是富集大离子亲石元素(如Rb、Ba、Th、U)，亏损高场强元素(如Nb、Ta、Ti)，高Sr/Y(31.8 ~ 77.5)和(La/Yb)(N)(13.6 ~ 72.6)，极低的Y (53 ~ 16.3 ppm)和Yb (0.35 ~ 1.53 ppm)。以及可以忽略不计的欧盟异常。他们的(Sr-87/Sr-86)(i)比值(0.70715 ~ 0.70884)、epsilon(Nd) (t)(-5.93 ~ -3.07)、锆石epsilon(Hf)(t)(-2.34 ~ +0.85)值和两阶段模式年龄(t - dm (Nd2) = 1.26 ~ 1.47 Ga;T-DM2(Hf) = 1.20-1.39 Ga)和低温花岗岩类特征表明，它们是新元古代下地壳的部分熔体，输入了富幔源基性岩浆。这些侵入岩的高sr /Y特征可能继承自南秦岭地体下地壳烃源岩。区域构造演化研究表明，该岩石形成于俯冲体制和俯冲-初始碰撞过渡环境。岩浆源区的高Sr/Y比值可能与高Sr/Y特征有关，而不是与特定的地球动力学背景有关。","doi":"","projection":"","language":"zh","share_type":"online","east":106.41,"west":106.31,"south":34.18,"north":34.22,"scale":null,"crs":null,"filesize":0.23,"share_policy":"a","ts_created":"2021-05-22T18:24:56.952297+08:00","doi_type":"国际公开共享数据","ts_updated":"2021-05-25T21:34:08.434520+08:00","time_description":"237百万年来","datas_group":3,"time_description_en":"237 million years","data_format":null,"project":[11],"specials":[],"cite":null,"review_status":5,"review_invite":[{"user_name":"颜茂都","username":"颜茂都","email":"maoduyan@itpcas.ac.cn","is_cancel_expert":true}],"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":"8070377b-0389-48fc-b2c0-c42408a5dbf7","three_pole":null,"third_pole":null},"username":"黄文婷","review_time":null,"protected_duration":null,"protected_describe":null,"is_important":false,"hit_count":341}