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MIX-ISOCHRON AND ITS SIGNIFICANCE IN ISOTOPIC CHRONOLOGY

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Science in China,Ser.B 1988年第1期31卷 96-108页

作者：覃振蔚 guiyang institute of geochemistry academia sinica

This paper presents a theoretical study in an attempt to modify the isochron theory. It isshown that isochrons can be obtained for closed systems provided the following linear condition ismet at the initial moment: I0 = KR0 + d, where both K and d are constants, R and I standfor the parent and daughter isotopic ratios, respectively. Isochrons established in this way aretermed generalized isochrons, with their equation as I = [（K + 1） e2t--1]R + d. Isochronswith uniform initial isotopic ratios （i. e. when K = 0） are called special isochrons; and isochronsobtained from binary-mixing systems, named mix-isochrons, are typical examples of generalizedisochrons. Age calculated from a mix-isochron is excessively high when K>0 and low while K0, sometimes even lowerthan the initial ratio of the earth, e.g. BABI for Sr isotope ratio. The pr

关键词： MIX-ISOCHRON AND ITS SIGNIFICANCE IN ISOTOPIC CHRONOLOGY

A NOVEL KIND OF FOSSIL PIGMENTS FOUND IN SEDIMENTARY ROCKS

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Science in China,Ser.B 1984年第4期27卷 436-444页

作者：盛国英傅家谟 guiyang institute of geochemistry academia sinica

A new red compound found from organic sollvent extracts of sedimentary rocks is reporied inthis paper. It has been evidenced by experiments that the compound is not pollutant, por-phyrin or carotienoid pigments. By means of spectrography, UV-visible spectrophotometry,infrared spectrophotography, gas-chromatography, NPLC and GC-MS, the compound has beendetermined initially as an oxygen-containing pigment. The compound is highly stable under nor-mal temperature and shows two characteristic absorption peaks at 480 mμ and 519 mμ res-pectively. This new organic pigment has been detected in carbonate rocks, including the Ter-tiary, Triassic, Permian, Ordovician, Cambrian and Sinian rocks, But more study is neededfor understanding its structure, precursors and origin, as well as its significance in geoche-mistry.

关键词： A NOVEL KIND OF FOSSIL PIGMENTS FOUND IN SEDIMENTARY ROCKS

DISCOVERY OF SOME VANADIUM AND NICKEL MINERALS FROM ANTHRAXOLITE AND DISCUSSION OF THEIR ORIGIN

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Science in China,Ser.B 1984年第11期27卷 1197-1202页

作者：刘德汉林茂福 guiyang institute of geochemistry academia sinica

By means of optical identification, Seanning Electron Microscopic analysis, etc., finegranular dispersed millerite, violarite, karelianite and montroseite were discovered for thefirst time from anthraxolites at Shanglin and Hechi in Zhuang Autonomous Region ofGungxi. Based on the occurrence and texture of anthraxolites, we propose that they along withthe vanadium and nickel content must have been derived from the black carbonaceous andcalcareous shale and marl of mid-Devonian system and that these minerals may have beenproduced by thermal metamorphism from crude oil and bitumen containing metallo-organiccompounds, such as vanadium and nickel porphyrins at the late stage of oil-gas evolution.

关键词： DISCOVERY OF SOME VANADIUM AND NICKEL MINERALS FROM ANTHRAXOLITE AND DISCUSSION OF THEIR ORIGIN

陨石、超基性岩、花岗岩及其主矿物中某些微量元素的仪器中子活化分析

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地球化学 1976年第2期5卷 133-143页

作者： METEOEITE ANALYSIS GROUPinstitute of Atomic Energy, academia sinica guiyang institute of geochemistry, academia sinica 中国科学院原子能研究所陨石分析组中国科学院贵阳地球化学研究所陨石分析组

研究地球物质中化学元素的分布、迁移和转变的规律，进一步探讨地球的形成与演化过程是地球化学的主要课题之一。球粒陨石的平均化学组成可能代表着形成太阳系的太阳星云的平均化学组成，也是组成地球的初始物质，而地壳上的各种岩浆岩... 详细信息

研究地球物质中化学元素的分布、迁移和转变的规律，进一步探讨地球的形成与演化过程是地球化学的主要课题之一。球粒陨石的平均化学组成可能代表着形成太阳系的太阳星云的平均化学组成，也是组成地球的初始物质，而地壳上的各种岩浆岩都是从地球的初始物质经过熔融、调整、演化而逐渐形成的。我们通过对普通球粒陨石、超基性岩。

关键词：地球化学球粒陨石化学组成超基性岩花岗岩微量元素中子活化分析

MAGNETOSTRATIGRAPHY OF PERMO-TRIASSIC BOUNDARY SECTION OF MEISHAN OF CHANGXING,ZHEJIANG

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Science China Chemistry 1989年第11期32卷 1401-1408页

作者：李华梅王俊达 guiyang institute of geochemistry Academia Sinica. Guiyang 550002 PRC

A hundred and eleven samples were collected from the Permian-Triassic boundarysection of Meishan (31.1°N, 119.7°E) which includes the Changxing Formation of thelate Permian and the Qinglong Formation of early Triassic. The thickness of the sectionis about 60 m. Paleomagnetic results indicate that six normal and reversed polarity zoneswere recorded in the section which all belong to the Illawarra mixed interval. Theboundary of Permo-Triassic lies at 1.2 m (or 2.7 m) above the bottom of normal polarityzone V. The magnetic minerals in the rocks of the lower part of the Changxing Forma-tion mainly are goethite, haematite and titaniferous magnetite while in the upper part ofthe formation are chiefly titanomagnetite and magnetite, goethite is secondary. Magne-tite and haematite as the main magnetic minerals were included in marl and mudstone ofthe Qinglong Formation. Based on the results of the magnetically stable samples thepaleopole position of 50.7°N, 230.3°E was obtained, meanwhile, the

关键词： Changxing Permo-Triassic magnetostratigraphy

ATMOSPHERIC DENUDATION AND ABLATION PRODUCTS OF IRON METEORITE

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Chinese Science Bulletin 1989年第10期34卷 843-845页

作者：陈永亨王道德 guiyang institute of geochemistry Academia Sinica

Many authors have made simulation tests on ablation process of meteoroid by melting iron meteorites and set up a series of standard criteria for identification of the ablation cosmic dust of iron meteorite. A strong c... 详细信息

关键词： iron meteorite Xinjiang iron wüstite ablating iron meteorite.

CORRELATION BETWEEN δD AND H_2O IN SOME GRANITOID OF CHINA

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Science China Chemistry 1989年第11期32卷 1383-1392页

作者：于津生虞福基覃振蔚 guiyang institute of geochemistry. academia sinica. guiyang 550002. PRC

The correlation between δD and H2O content in granitoid can be divided into threetypes: closed-system crystallization type （Darongshan type）: a flat positive linear corre-lation; open-system degassing type （Laoshan type）: a nearly vertical linear positive cor-relation; meteoric hydrothermal exchange type （Gabug type）: an irregular negative trendcorrelation.

关键词： granitoid

REFLECTIVE SPECTROSCOPIC CHARACTERS OF STIBNITE

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Chinese Science Bulletin 1983年第4期28卷 514-517页

作者：郑楚生 guiyang institute of geochemistry Academia Sinicaeflective spectroscopy of minerals based on reflective spectra with changing wavelength has found its application in the quantitative study and description of most reflective optical properties of opaque minerals. It is a further development towards quantitative and spectral description in the optical study of minerals by ore microscopy.

Reflective spectroscopy of minerals, based on reflective spectra with changing wavelength, has found its application in the quantitative study and description of most reflective optical properties of opaque minerals. It is a further development towards quantitative and spectral description in the optical study of minerals by ore microscopy.

关键词： reflective rotation minerals valley downward manifestation listed reviewing ordinate slightly

DTA CHARACTER OF BIOTITE OF DIFFERENT GENETIC TYPES AND THEIR IMPLICATIONS

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Chinese Science Bulletin 1988年第13期33卷 1142-1143页

作者：陈国玺 guiyang institute of geochemistry Academia Sinica

Detailed DTA measurements were made on 46 biotite samples from granites of different genetic types in South China and 35 in the Sanjiang area. The DTA curves and shape of melting products differ apparently between biotites of different genetic types: (i) The peak temperature at which OH releases in crust-type granite biotite ranges from 1070—1150℃ for South China samples and 1050—1180℃ for Sanjiang samples. In contrast, the OH releasing temperature in crust-mantle

关键词： crust mantle granite melting apparently dehydration releasing facilitating weakened temper