全球苦橄岩与太古宙科马提岩对比：全数据模式的启示  

The comparison of global picirte and Archean komatiite： implications from the whole data model

作　　者：罗应 袁方林 金维浚[4] 刘学龙[1] 张昌振 刘欣雨[3] 张旗[4] 余海军 Luo Ying;Yuan Fanglin;Jin Weijun;Liu Xuelong;Zhang Changzhen;Liu Xinyu;Zhang Qi;Yu Haijun(Kunming University of Science and Technology,Kunming 650093;Key Laboratory of Geological Information Technology,Ministry of Natural Resources of the People＇s Republic of China,Beifing 100037;State Key Laboratory of continental Dynamics,Department of Geology,Northwest Universityl,Xi＇an 710069;Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 100029;Key Laboratory of Sanjiaag Mineralization and Resource Exploration and Utilization,Ministry of Land and Resources,Kunming 650051)

机构地区：[1]昆明理工大学,昆明650093 [2]自然资源部地质信息技术重点实验室,北京100037 [3]西北大学地质学系、大陆动力学国家重点实验室,西安710069 [4]中国科学院地质与地球物理研究所,北京100029 [5]国土资源部三江成矿作用及资源勘查利用重点实验室,昆明650051

出　　处：《地质科学》2018年第4期1267-1284,共18页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：云南省科学技术奖“杰出贡献奖项目”专题四（编号：2017001）、自然资源部地质信息技术重点实验室开放课题（编号：KKF0201821043）、昆明理工大学矿产普查与勘探重点学科建设经费项目（编号：14078170）和国家自然科学基金项目（编号：41862009）资助.

摘　　要：苦橄岩和科马提岩都是富镁的超镁铁质火山岩，早先，学术界大多关注它们之间的相似性，而对于它们之间的差异性很少强调。于是认为二者的地球化学性质近似，成因类似，形成条件类似。本文采用全数据模式的研究方法，从数据库收集了全球太古宙全部科马提岩和后太古宙全部苦橄岩数据，对比的结果表明，太古宙科马提岩与后太古宙苦橄岩完全不同，它们之间几乎没有可比性。科马提岩与苦橄岩，不仅地球化学特征不同，而且成因不同，形成条件不同，产出时代不同，源区组成也不同。这种不同，反映了太古宙和后太古宙不可能属于同样的构造体制。太古宙是火球时代，地球异常的热，主导的可能是静止盖幔构造（stagnant lid tectonics）；后太古宙是热球时代，地球相对冷了许多，主导的是板块构造（plate tectonics）。科马提岩在太古宙广泛出露，无需地幔柱模式；而苦橄岩在后太古宙很少出露，才真正需要地幔柱模式。Both the picrite and komatiite are Mg-rich ultramafic volcanic rocks. In the past, most of the academic community paid attention to the similarities between picrite and komatiite, but the differences of them were little concerned. So these scholars considered that picrite and komatiite were similar in geochemical properties, origin, and forming conditions. In my study, the method of whole data has been adopted to analyze the differences between the Picrite and Komatite through the global database. However, the result of the research shows that there are almost no comparisons between picrite and komatite. Picrite and Komatiite are not only different from the geochemical characteristics, but also from their genesis, forming conditions, age, and composition of the source region as well. Since the Archaean was the fireball era and the earth＇s extremely hot, the dominant structure might be stagnant lid tectonics. In Post- Archean era, the earth was relatively cold and dominated by plate tectonics. The komatiite is plentifully exposed in the age of Archean, so it is no need for the mantle plume model. On the contrary, the picrite is rarely seen in the Post-Archean and it needs this model.

关 键 词：苦橄岩 科马提岩 全数据模式 太古宙 后太古宙 静止盖幔构造 板块构造 

分 类 号：P584[天文地球—岩石学] P588.1[天文地球—地质学]