硫化物饱和的和硫化物未饱合的科马提岩熔融体的化学和热力模拟

科马提岩熔融体的化学的和热力的模拟试验进行了我们对卡姆巴尔达型镍矿床成因的认识。化学模拟的价值明显地受工程使用资料的质量的限制。现有的模式是以Rajamani和Naldrett(1978)提出的镍分配系数的实验测定为根据的。这些系数是在1200℃和1300℃间温度的玄武岩熔融体在未知S及O逸度条件下测定的。如果把这些资料用于模拟科马提熔融体的分馏,就可外推更多超镁铁质成分和超过1500℃温度条件下的结果。     

原始地核:离子探针为西格陵兰和恩德比地(南极洲)太古宙地区大约4000Ma地壳物质提供的证据

对古老岩区的典型花岗片麻岩中提取单—锆石颗粒内一些直径为15μm的点,用离子探针测量了~(207)pb/~(206)pb的比值表明,这些地方保存一个~(207)pb/~(206)pb比值范围。在含有较高铀含量的锆石内一般可测得~(207)pb/~(206)pb的最低比值,计算的~(207)pb/~(206)pb年龄,一般与反映它们形成后各岩层经受的比较主要地质事件可以对比。似乎可能的是,在年轻事件期间,由于遭受锆石粒高铀区放射性的破坏,使这些地带的放射性铅损失了。在含     

元古代及早古生代的微古植物化石

当前,在许多国家和地区古生物工作者十分重视研究古老的微植物化石,特别对于晚元古代及早古生代的微古植物化石的研究,取得了显著成绩。根据外貌特征,微古植物可以分成六个主要群落:球状藻(Sphaeromorphida),棱状藻(Scaphomorphida),多面藻(Edromorphida),刺球藻(Sphaerohystrichomorphida),卵形藻(Ooidomorphida)及椭状藻(Ellipasoidomorphida)。并包括几个亚群落和很多     

欧亚黄土中古地磁极性界线的地层学解释

本文以欧亚黄土中记录的布容一松山极性倒转界线为例,简要回顾近年来对黄土中 古地磁极性界线地层学解释的讨论。研究表明,由于在记录古地磁极性转换时存在不同程度 的“错位”,黄土中所测的极性界线的年代地层意义存在很大的不确定性。就中国黄土而言,第 8层黄土（L8）中下部或第8层古土壤（S8）顶部测得的布容-松山界线系“错位”的产物,该层位 的年龄应老于 0.79MaB.P.对黄土中测得的Cobb Mountain极性事件界线进行地层学解释, 推论蓝田猿人化石层位的年龄1.2MaB.P.     

THE TSINAN INTRUSIVE.

Ⅰ. INTRODUCTION. "One of the striking features in the Tsinan plain is a group ofisolated hillocks standing up boldly from it. Though mainly overgrown withvegetation, they are distinguishable by ther shape and dark colour from thelight-grey tabular limestone islands which for the last outposts pushedforward by the mountains lying to the south."     

Fossil Vertebrates from Kuangyuan, N. Szechuan, China

正 During the late spring of 1941, Messrs. M. N. Bien, T. H. Mi and the present writer were fortunate enough to discover several localities of vertebrate fossils. The geological condition will be reported in another paper' and need not be repeated there. Most of the fossils were derived from the hill     

Notes on the Geological Structure of the Washan-Omeishan Region

I. INTRODUCTION Bordering the SW margin of the Red Basin of Szechuan runs a roughly N-S mountain range which includes such mountains as Washan, Omeishan and Talliangshan (Pl. I) and for the sake of convenience is designated with the name of Liangshan Range. Among these mountains only the geology of the Omeishan region is fairly well known in consequence of the works done by many a geologist; of the Washan region, though had been visited by     

SUBDIVISIONS OF THE JURASSIC, CRETACEOUS AND TERTIARY COAL-BEARING STRATA OF RUSSIAN MARITIME AND AMUR PROVINCES, AND OF SAKHALIN ISLAND

As is well known, the first information on the coal-bearing strata of the Russian Far East and their characteristic fossil flora was given by the acadeinician Prof. Schmidt (2), and his fellow-traveller Glehn (13), to Lopatin, Bogoluibsky (9), A. Koeppen (26) and others. However the