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广东麒麟绿钙闪石巨晶的地球化学特征 总被引:1,自引:0,他引:1
本文对罕见的幔源绿钙闪石巨晶进行了综合的地球化学分析,主要元素,稀土微量元素和Sr,Nd同位素的特征表明;绿钙闪石巨晶是碱性玄武岩浆在地幔条件下的结晶产物;相对于寄主玄武岩,绿钙闪石巨晶均属捕虏晶,它们与共存的橄榄岩包体无成因联系,其形成可能与共存的黑色包体有关。 相似文献
174.
The Discovery of Phlogopite Exsolution Lamellae in Garnets of Eclogite Inclusions, Liaoning Province
Zhou Xiuzhong Institute of Mineral Deposits Chinese Academy of Geological Sciences Beijing Liu Xinzhu 《《地质学报》英文版》1997,71(1):33-42
In No. 50 kimberlite pipe of Fuxian County, Liaoning Province, an eclogite inclusion(nodule), which is extremely rare in kimberlites, was discovered and phlogopite exsolutionlamellae were found in garnets of the inclusion. Microscopic, TEM and energy spectral observa-tions and studies confirmed that these lamellae are phlogopite. They are colourless and acicularin section, generally 0.5-5μm in width and 10-100μm in length. Nevertheless, fine lamellae,0.05-0.1μm wide and 1-2μm long, are also well developed. Along [111] of the garnet, three setsof phlogopite lamellae show oriented arrangement approximately at angles of 60°-70°, indi-cating that these lamellae might be the product of exsolution from garnet as a result ofpressure-release when eclogite ascended from the relatively deep level to the relatively shallowlevel of the mantle. Tiny acicular exsolution minerals (or inclusions) are commonly found ingarnet and pyroxene in eclogite inclusions of kimberlites all over the world and it has been re-ported that the identified exsolution minerals include pyroxene and rutile. This is the first timethat phlogopite exsolution lamillae were found in eclogite inclusions in the world. 相似文献
175.
Spatial-temporal Frame,Evolution and Mineralization of the Northern Qilian Metallogenic Province 总被引:1,自引:0,他引:1
Sun Haitian Wu Jieren Li Jinping Institute of Mineral Deposits Chinese Academy of Geological Sciences Beijing Xi''an Institute of Geology Mineral Resources Chinese Academy of Geological Sciences Xi''an Shaanxi Institute of Mineral Deposits Chinese Academy of Geological Sciences Beijing 《《地质学报》英文版》1997,71(2):204-216
Four metallogenic epochs occurred in different tectonic environments during theevolution of the Northern Qilian metallogenic province through the geological time. The Mid-dle Proterozoic metallogenic epoch witnessed the tectonic environment of crustal breakupcaused by mantle diapirism, in which ultramafic-mafic rocks were intruded along beep faultbelts and the superlarge Jinchuan magmatic Cu-Ni sulphide deposit was formed. In theMiddle-Late Proterozoic metallogenic epoch the crust was further broken to form anintracontinental rift, in which the Chenjiamiao style massive Cu-Fe sulphide deposits hosted bybasic volcanic tuff were formed in the lower volcano-sedimentary sequence, while the largesedex type Jingtieshan style Fe-Cu deposits were formed within the upper abyssal carbon-richargillaceous sedimentary sequence. The Early Palaeozoic saw the aulacogen environment, with-in which the Baiyinchang style superlarge massive base and precious metal sulphide depositshosted by quartz keratophyric tuff were formed in the Middle-Late Cambrian rifted island arcand the massive Cu-Zn sulphide deposits and magmatic chromite deposits associated with theophiolite suite were formed in the Early-Middle Ordovician, and the Honggou style massiveCu-Fe sulphide deposits hosted by spilite were formed in the Late Ordovician back-arc basinenvironment. In the Late Palaeozoic-Meso-Cenozoic, the metallogenic province went into anintracontinental orogenic stage characterized by compressive tectonic environment, in whichthere occurred carbonate-quartz vein type and tectono-alteration gold deposits associated withductile-shear structures. 相似文献
176.
Isotope Tracing and Prospecting Assessment of Gold-Silver Deposits in Zhejiang Province 总被引:1,自引:0,他引:1
Chen Haoshou Xu Butai Department of Earth Sciences Zhejiang University Hangzhou Zhejiang Zhejiang Institute of Geology Mineral Resources Hangzhou Zhejiang Liu Xinzhu 《《地质学报》英文版》1997,71(3):293-304
Three different types of gold and silver deposits in Zhejiang Province(Huangshan gold deposit, Zhilingtou gold-silver deposit and Haoshi silver deposit) showmarked differences in lead and strontium isotopic composition, suggesting three differentsources and geneses of these deposits. The Huangshan gold deposit features low initial Srisotope ratios and low μ values or low content of radiogenic Pb and its ore-forming materialscame primarily from the upper mantle; the Zhilingtou gold-silver deposit shows high initial Srisotope ratios and high μ values or high content of radiogenic Pb and the ore-forming materialswere derived mainly from the upper crust; and the Haoshi silver deposit has its Pb and Srisotope ratios between the above two cases with the ore-forming materials stemming from boththe mantle and the crust. The characteristic Pb isotopic composition may serve as an indicatorfor prospecting for different types of ore deposits. 相似文献
177.
Zhang Sheng Li Tongjin Wang LiankuiGuangzhou Institute of Geochemistry Chinese Academy of SciencesWushan Guangzhou 《《地质学报》英文版》1997,71(4):433-445
The Changkeng gold-silver deposits consist of a sediment-hosted, disseminated gold deposit and a replacement-type silver deposit. The mineralizations of gold and silver are zoned and closely related to the silicification of carbonate and clastic rocks, so that siliceous ores dominate in the deposit. The mineralizing temperature ranges mainly from 300 to 170℃, and K+, Na+, Ca2+, Mg2+, and Cl- are the major ions in the ore-forming fluid. Calculations of distribution of metal complexes show that gold is mainly transported by hydrosulphide complexes, but chloride complexes of silver, iron, lead, and zinc, which are transformed into hydroxyl and hydrosulphide complexes under neutral to weak-alkaline circumstances in the late stage, predominate in the ore-forming solutions. Water-rock interaction is confirmed to be the effective mechanism for the formation of silver ores by computer modelling of reaction of hydrothermal solution with carbonate rocks. The solubility analyses demonstrate that the precipitation 相似文献
178.
福建沙县地区早白垩世火山岩成因及构造环境分析 总被引:1,自引:0,他引:1
本文着重阐述了沙县地区早白垩世火山岩地球化学特征,论证了中性与酸性火山岩的成因及物质来源,认为二者为不同源岩浆演化的产物,其岩浆物质来源于壳幔混源区,为省内双峰式火两端员岩石间成因关系的分析研究提供了新的例征。 相似文献
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180.
巴基斯坦北Potwar形变区是西北喜马拉雅褶皱逆冲带前陆区的一部分,绘制了该区的地震活动性图. 与相邻地区比较,该区地震并不活跃,没有显示出与地表地质构造相关的清晰地震活动图象. 做出了4次地震的震源机制解. 结果表明,有3次地震是左旋走滑断层活动,另一次地震是逆断层活动. 地震震源机制解的P轴方向为NW-SE和NE-SW. 现今的构造形变很可能也包括基底的形变. 相似文献