甘肃及其邻域地壳中间界面的某些性质

本文根据地壳中间界面上反射波的运动学和动力学参数，探测了地壳中间界面的埋深、复盖介质中波的传播速度、温度、压力、反射性、透过性、弹性等性质。     

一种反映岩浆演化(分异)程度的定量化综合指标——酸度指数(AI)和岩石酸度系列

林宝增同志这篇文章,是对岩浆演化程度进行定量综合研究的一种探索,我们希望广大岩矿研究者验证这个公式的合理性。但这篇文章立论的基本思想还是一元论的岩浆分异作用形成各种不同的岩石。现代岩石学的认识已是多元的,除分异作用外,还有同化作用,岩浆混合作用等,酸度不同的各种岩石不能一概视为岩浆分异作用的产物。对此,我们希望广大读者也来写写你们的实践经验和意见。     

二红洼镁铁-超镁铁杂岩体特征及成因

新疆哈密二红洼镁铁-超镁铁杂岩体地表分南北两个岩体,深部可能连为一体,可划分为两个侵入期、四个岩相.第一侵入期构成岩体的主体部分,分异良好,由重力结晶分异形成自橄揽岩相、橄榄辉长岩相向含石英苏长辉长岩相的分异趋势,基性程度依次降低.岩浆多次贯入使得纵向上橄榄岩相和橄榄辉长岩相重复出现.第二侵入期辉长苏长岩相分异程度低,岩性稳定,为岩浆快速冷凝的产物.岩浆属于拉斑玄武岩系列,发生过金属硫化物熔离,有利于铜镍硫化物成矿.     

Petrochemistry,Age and Petrogenesis of the Shexian Pluton in Southern Anhui

The Shexian gneissic granodiorite in southern Anhui trends NE 55° from Shexian in the west to Guitoujian in the east with a length of 22 km and an outcrop area of 32 km. It was considered formerly to be Caledonian on the basis of a biotite K-Ar age of 474 Ma (1982). However, new evidence indicates that it may be Early Jinning in age as shown by: (1) it is found intruding into the Mid-Proterozoic Shangxi Group and is unconformably overlain by the Sinian Xiuning Formation, and (2) a zircon U-Th-Pb age of 928 Ma is obtained for the pluton. The pluton is composed of plagioclase (An=27.37%), K-feldspar(14%), biotite(16%) and quartz(32%). Accessory minerals are ilmenite (150g/T), xenotime (15g/T). garnet(25g/T), monazite(10g/T), zircon (20g/T) and apatite (104g/T). Petrochemical characteristics of the intrusion are:(l) Al-enrichment (A/NKC=1.30); (2) H₂O enrichment (H₂O= 1.74%); and (3) low oxidation index (f ’=0.10). It belongs to the continental crust transformation type as evidenced by: (1) MF and Mg/Y values of biotite are 0.41 and 0.31 respectively; (2) (⁸⁷Sr/⁸⁶Sr)=0.71119; (3) δ Eu=0.52; and (4) A/NKC=130. The Shexian pluton is therefore considered as a product of melting of phyllite at depth in the light of similarities in trace element and REE contents with the phyllite of the Banxi Group. Calculations of REE batch partial melting indicate that it may have resulted from 75% melting of the Banxi phyllite.     

Sepctral Reflectance of Recently Fallen Chondrites and Some Igneous Rocks in China

Polarization and radiation measurements and microwave studies show that the planets and the great majority of asteroids in the solar system are covered by soils similar to regolith on the moon surface.The soils repesent the composition of the asteroids and the geological elements of the planets. The spectral reflectance shows a tendency of decreasing from near ultraviolet,visible to near-infrared in order of LL→L→H→H with increasing Fe^0/Fet rato and toward to absorption for Jilin,Xinyang and Zanoyang ordinary chondrites and Qinzhen enstatite chondrite recently fallen in China,The same chemical group of meteorites feature deeper absorption valleys with increasing metamorphic grade.The spectal reflectance of igneous rocks varies from strong to what is like that of H-group chondrites in order of acid→basic→ultrabasic rocks.     

新疆菁布拉克基性超基性岩带的Sm－Nd同位素年龄

Ｓｍ－Ｎｄ矿物等时线定年结果表明，菁布拉克岩带基性超基性岩形成于３２０Ｍａ，其形成时代晚于早石炭世早期的火山活动，是塔里木板块与巩乃斯微板块碰撞晚期拉张构造环境的产物。     

黔东北多金属成矿体系及其金矿的成矿预测

本文根据煌斑岩与金矿的成因关系，以及黔东湘地区汞、铅、锌等多金属矿产的分布特点，并结合１∶２０万区域地球化学测量成果，提出了黔东北地区汞、铅、锌成矿带为同一热源下，由于热传导产生的温度差异而形成分异的并可能包含有Ａｕ、Ａｇ等贵金属的一成矿体系，并对该体系的成因建立了成因模式。同时，运用该模式对区内待发现的Ａｕ、Ａｇ等金属矿产作出了找矿远景区的预测。     

铼—锇同位素体系在基性—超基性岩中应用现状的综述

综述了该同位素体系晚侏罗世以来，尤其是现代地幔岩石的研究成果表明，地幔在晚侏罗世以来在１８７Ｏｓ／１８７Ｏｓ比值方面显示出非均一性，其比值从０．９０－１．２６，但此类岩石的１８７Ｏｓ／１８６Ｏｓ比值分别与各个不同研究者所确定的地幔演化线相到致；来自较古老正常地幔或贫化地幔的岩石，在锇同位素方面体现为１８７Ｏｓ／１８６Ｏｓ初始比值接或低于Ｒｅ－Ｏｓ同位素体系地幔演化线值。在此类岩石中，Ｒｅ－Ｏｓ同位     

YSZ60重型绳索取芯钻具完成1139m深孔钻进

ＹＳＺ６０重型绳索取芯钻具用于深孔施工，经采取合理选用钻头，优选冲洗液配方，强化施工管理等综合配套技术措施，圆满完成了１１３９ｍ深孔钻进行任务，在设计深度见矿，并取得台效５６０．７０ｍ，金刚石钻头平均寿命５６．８０ｍ，每ｍ直接成本１２６．５０元，全孔节约１．３９万元的经济技术效益。