Geochemistry of some banded iron-formations of the Archean supracrustals,Jharkhand-Orissa region,India     

H. N. Bhattacharya  Indranil Chakraborty  Kaushik K. Ghosh 《Journal of Earth System Science》2007,116(3):245-259

Banded iron-formations (BIF) form an important part of the Archean supracrustal belts of the Jharkhand-Orissa region, India. Major, trace and REE chemistry of the banded iron-formation of the Gandhamardan, Deo Nala, Gorumahisani and Noamundi sections of the Jharkhand-Orissa region are utilized to explore the source of metals and to address the thermal regime of the basin floor and the redox conditions of the archean sea. Hydrothermal fluids of variable temperatures might have contributed the major part of the Fe and other trace elements to the studied banded iron-formations. Diagenetic fluids from the sea floor sediments and river water might have played a subdued role in supplying the Fe and other elements for the banded iron-formations.  相似文献   

Fluid pressure and hydraulic fracturing in hydrothermal ore formation at gold deposits     

N. S. Ostapenko  O. N. Neroda 《Russian Journal of Pacific Geology》2007,1(3):276-289

The active role of fluids in the formation of ore-localizing structures expressed in dilatancy and hydraulic fracturing is suggested from the results of detailed comprehensive study of the Tokur gold deposit in the Upper Amur region, Russia, and the surveying of the published data on fluid pressure that characterizes formation of other hydrothermal deposits different in depth, morphology of orebodies, and their localization with respect to rocks of various permeability. Development conditions and possible implications of hydraulic fracturing for ore formation are considered. Indications of involvement of this mechanism in the orebody formation at the Pokrovsky, Berezovsky, and Nezhdaninsky gold deposits in Russia and the Bendigo deposit in Australia are discussed.  相似文献   

Geological and geochemical characteristics of the Baimazhai Ni-Cu-（PGE） sulphide deposit in Yunnan, China     

PU Chuanjie QIN Dexian NIAN Hong ZHANG Xueshu Franco PIRAJNO FAN Zhuguo 《中国地球化学学报》2007,26(4):374-383

The sulphide ores of the Baimazhai deposit, although typically orthomagmatic, locally exhibit peculiar textural features and are intimately associated with hydrothermal minerals, such as biotite, amphibole and chlorite. This association suggests that the magmatic sulphide ores were subjected to hydrothermal alteration and subsequent redistribution, resulting in the observed textural features. Geochemically, the Baimazhai sulphide ores are enriched in Cu, Pd and Au, which,according to previous studies, reflects the action of hydrothermal fluids. Interestingly, Ar-Ar dating yielded the plateau ages of about 160–170 Ma, which are at odds with the established Permian age of the Emeishan large igneous province. We interpreted these younger ages as due to thermal resetting during post-Permian tectonothermal events. We have proposed a model in which tectonic movements and hydrothermal fluids related to these events modified the pre-existing magmatic sulphides. Given the degree of overprint, we suggested two possible scenarios: 1) the sulphide disseminations that surround the massive magmatic ores are the result of deformation and hydrothermal alteration; and 2) there were both magmatic massive and disseminated sulphides, in which case the scale and relocation of remobilization would have been smaller, but still detectable.  相似文献   

REE geochemical characteristics of the No. 302 uranium deposit in northern Guangdong, South China   总被引：1，自引：0，他引：1  

ZHANG Guoquan HU Ruizhong BI Xianwu FENG Haisheng SHANG Pengqiang TIAN Jianji 《中国地球化学学报》2007,26(4):425-433

The No. 302 uranium deposit, located in Guangdong Province, is a typical granite-type uranium ore deposit REE geochemical characteristics of the wall rocks, pitchblende, altered rocks, calcite and fluorite from this deposit have been systematically studied in this paper. The result showed that the alkali-metasomatic granites and other altered rocks have the same REE distribution patterns as Indosinian granites. It is indicated that the hydrothermal ore-forming solution had altered the Indosinian granites, and ore-forming materials may directly originate from the Indosinian granites. Calcite and fluorite of different stages are the products derived from the same source but different stages. The evolution and degassing of the mineralizing solution might induce LREE enrichment to varying degree. Mantle fluid and a large volume of mineralizer may be the crucial factors controlling uranium mineralization, and the hydrothermal solution with mineralizer played an important role in U transport and concentration. Meanwhile, the degassing of CO2 might promote U and REE precipitation.  相似文献   

Oxygen isotope evidence for short-lived high-temperature fluid flow in the lower oceanic crust at fast-spreading ridges     

Laurence A. Coogan  Craig E. Manning  Robert N. Wilson  E.I.M.F   《Earth and Planetary Science Letters》2007,260(3-4):524-536

Millimeter-scale amphibole veins in the lower oceanic crust record fracture-controlled fluid flow at high-temperatures but the importance of this fluid flow for the thermal and chemical evolution of the lower oceanic crust is unclear. In the section of lower oceanic crust recovered at Hess Deep from ODP Hole 894G, which formed at the fast-spreading East Pacific Rise, these veins are randomly distributed with an average spacing of  1 m. We unravel the history of fluid flow through one of these veins by combining in situ O-isotope analyses of wall-rock plagioclase with major element analyses, geothermometry and diffusion modeling. Thermometry indicates vein sealing by amphibole at  720 °C over a narrow temperature interval (± 20 °C). In situ O-isotope analyses by ion microprobe, with a precision of < 0.5‰, reveal zoning of O-isotopes in plagioclase adjacent to the vein. The zoning profiles can be reproduced using a diffusion model if the duration of O-isotope exchange was ≤ 100 yr. A similar interval of fluid–rock exchange is suggested by modeling potassium depletion in plagioclase adjacent to the vein. If representative of fracture controlled fluid flow in the lower oceanic crust the limited duration of fluid flow, and its occurrence over a narrow temperature interval, suggest that high-temperature fluid flow in this porosity network does not transport significant heat.  相似文献   

The use of multivariate statistics to elucidate patterns of floodplain sedimentation at different spatial scales     

Martin C. Thoms  Melissa E. Parsons  John M. Foster 《地球表面变化过程与地形》2007,32(5):672-686

Floodplains are depositional features of riverine landscapes that display complex sedimentation patterns that are amenable to multi‐scale approaches. We examined sedimentation in the Lower Balonne floodplain, Queensland, Australia, at three different spatial scales: the channel (10³ km), floodplain process zone (10 km) and geomorphic unit (10² m) scales, and compared scale‐related patterns evident from stratigraphy with those evident from quantitative multivariate analysis. Three stratigraphic sequences were found in the Lower Balonne floodplain: generally fining upward, episodic fining upward, and mud‐dominated. Stratigraphical analysis revealed the detailed character of sedimentary sequences embedded within the scale patterns derived from multivariate analysis. Multivariate statistical analyses of a range of textural and geochemical data revealed different patterns of floodplain sedimentation at each scale. At the channel scale, sediment texture and geochemistry were more heterogeneous in the Culgoa River than in Briarie Creek. At the floodplain process zone scale clear patterns of sediment texture and geochemistry were observed along the upper, mid and lower floodplain process zones of Briarie Creek, but not along the Culgoa River. At the geomorphic unit scale, clear patterns of sediment texture and geochemistry were observed among the bank, buried channel and flat floodplain units of the Culgoa River, but were not as clear in Briarie Creek. Recognition of rivers as hierarchically organized systems is an emerging paradigm in river science. Our study supports this paradigm by demonstrating that different sedimentation patterns occur at different scales to reveal a hierarchically organized floodplain environment. Copyright © 2006 John Wiley & Sons, Ltd.  相似文献   

Chemical fingerprinting of hydrothermal zircons: an example from the Gidginbung high sulphidation Au-Ag-(Cu) deposit, New South Wales, Australia     

K.C. Lawrie  Christopher G. Ryan  Lance P. Black 《Proceedings of the Geologists' Association. Geologists' Association》2007,118(1):37-46

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闽中地区次火山-热液金（银）矿床成矿系列及资源潜力   总被引：3，自引：0，他引：3       下载免费PDF全文

黄树峰陈玉水  林美龙李秋平 《中国地质》2005,32(1):115-121

闽中地区是福建省金银成矿集中区,其上规模成矿主要集中于晚侏罗世次火山活动阶段。次火山-热液金(银)矿床的形成,矿、热、水“三源”是基本必要条件,北西、北东向两组构造带的复合是成矿定位的关键。在断隆带、坳中隆、坳中凹不同构造环境中,相应地递次形成(次)辉绿岩-闪长玢岩、(次)英安斑岩、(次)流纹斑岩等区域次火山-热液金(银)矿床成矿系列的3个亚系列;在垂向空间分布上,自上而下构成(微)细粒浸染型、石英脉型、破碎带蚀变岩型、隐爆角砾岩型、次火山岩型等工业矿床类型分带序列。金矿资源潜力在50t以上。  相似文献   

Expulsion of geopressured hydrothermal system along active faults and its relation to the occurrence of earthquakes in the Shinanogawa seismic belt,Japan   总被引：2，自引：0，他引：2  

Yasue Oki  Osamu Sato 《中国科学D辑(英文版)》2005,48(2):273-281

The 1995 Northern Niigata Earthquake (M 6.0) occurred at a shallow depth in the Niigata seismic gap. The anomaly areas in temperature, electrical conductivity and Cl- concentration of groundwater trend northeast as linear distribution in the epicentral area and are approximately coincident with the area of the seismic intensity 6 (JMA scale). The distributions of seismic intensity 6 and groundwater anomalies convincingly imaged the presence of a buried active fault beneath the epicentral area. The occurrence of this earthquake and the anomalies of groundwater were related to the expulsion of geopressured hydrothermal system (GHS). All epicenters of the destructive earthquakes along the Shinanogawa seismic belt are actually located in the buried active fault zones characterized by the areas of temperature and geochemical anomalies of groundwater. These earthquakes might have been triggered by the activity of GHS. The expulsion of GHS along an active fault in combination with the thermal softening of fault  相似文献   

Geochemistry of ore-forming fluids and geological significance   总被引：1，自引：0，他引：1  

Ping?ShenEmail author  Yuanchao?Shen  Tiebing?Liu  Guangming?Li  Qingdong?Zeng 《中国科学D辑(英文版)》2005,48(11):1921-1931

The Kuoerzhenkuola gold field (including the Kuoerzhenkuola and the Buerkesidai gold deposits) is the most important one in the Sawuer gold belt, northern Xinjiang, China. Isotopic studies including D, O, He, C, S, Pb and Sr reveal that the ore-forming fluids of the Kuoerzhenkuola and the Buerkesidai deposits shared the same source: the water of ore fluids was magmatic water and minor meteoric water; the mineralizers and ore materials derived mainly from mantle beneath the island arc, and partially from crust. The ore-forming fluids of two deposits are a mixture of mantle-derived fluids incorporated by crust-derived fluid, and meteoric water. Based on these results, combined with the consideration of the tectonic setting and geological features, we suggest that the two gold deposits in the Kuoerzhenkuola gold field, Sawur gold belt share the same genesis, and are volcanogenic hydrothermal gold deposits occurring in the same caldera.  相似文献