Environmental effect and genetic influence: a regional cancer predisposition survey in the Zonguldak region of Northwest Turkey     

Selahattin Kadir  A. Piril Önen-Hall  S. Nihal Aydin  Cengiz Yakicier  Nurten Akarsu  Murat Tuncer 《Environmental Geology》2008,54(2):391-409

The Cretaceous-Eocene volcano-sedimentary units of the Zonguldak region of the western Black Sea consist of subalkaline andesite and tuff, and sandstone dominated by smectite, kaolinite, accessory chlorite, illite, mordenite, and analcime associated with feldspar, quartz, opal-CT, amphibole, and calcite. Kaolinization, chloritization, sericitization, albitization, Fe–Ti-oxidation, and the presence of zeolite, epidote, and illite in andesitic rocks and tuffaceous materials developed as a result of the degradation of a glass shards matrix, enclosed feldspar, and clinopyroxene-type phenocrysts, due to alteration processes. The association of feldspar and glass with smectite and kaolinite, and the suborientation of feldspar-edged, subparallel kaolinite plates to fracture axes may exhibit an authigenic smectite or kaolinite. Increased alteration degree upward in which Al, Fe, and Ti are gained, and Si, Na, K, and Ca are depleted, is due to the alteration following possible diagenesis and hydrothermal activities. Micromorphologically, fibrous mordenite in the altered units and the presence of needle-type chrysotile in the residential buildings in which cancer cases lived were detected. In addition, the segregation pattern of cancer susceptibility in the region strongly suggested an environmental effect and a genetic influence on the increased cancer incidence in the region. The most likely diagnosis was Li-Fraumeni syndrome, which is one of the hereditary cancer predisposition syndromes; however, no mutations were observed in the p53 gene, which is the major cause of Li-Fraumeni syndrome. The micromorphology observed in the altered units in which cancer cases were detected may have a role in the expression of an unidentified gene, but does not explain alone the occurrence of cancer as a primary cause in the region.  相似文献   

Natural weathering of slags from primary Pb–Zn smelting as evidenced by Raman microspectroscopy     

《Applied Geochemistry》2016

  相似文献   

Alteration of naruo porphyry Cu (Au) deposit in the duolong ore-concentration area,tibet北大核心CSCD     

Gao K.  Duo J.  Tang J.-X.  Zhang Z.  Song J.-L.  Ding S.  Song Y.  Lin B.  Feng J. 《矿物岩石地球化学通报》2016,(6):1226-1237

The Naruo Cu( Au) deposit is a large porphyry deposit in Bangonghu-Nujiang suture, and it is an important part of Duolong ore •concentration area. In this study, alteration and mineralization zoning were constrained by detailed field investigation and indoor petrography observation in order to characterize the alteration and establish alteration-zoning model for exploration. The deposit has typical porphyry hydrothermal alteration system with successively alteration zoning of potassium silicate zone( with later propylitization) to sericite zone( with later propylitization) , propylitic zone, and hornfel zone from inner outward. The mineralization is closely related to potassium silicification and sericitization.  相似文献   

孟连回林低温热液构造角砾岩型金多金属矿   总被引：1，自引：0，他引：1  

王国洪  张吉寿  李庆锐  李媛  徐忠然 《云南地质》2010,29(1):29-31

对矿化蚀变带进行分析研究,矿床位于中-下石炭统接触裂隙破碎带中,总结成矿规律,建立找矿标志,为该区的地质找矿指明方向。  相似文献   

抱板金矿带金矿床地质特征和成矿规律   总被引：3，自引：0，他引：3  

秦联 《矿产与地质》1993,7(1):8-13

矿带中的金矿床以破碎带蚀变岩型金矿为主,金矿化与蚀变作用、燕山期岩脉、NE向戈枕断裂及环形构造关系密切.矿带具有多缀控矿构造,矿床分布具有等距性.  相似文献   

Geochemical signature of orogenic hydrothermal activity in an active tectonic intersection zone,Alpine Fault,New Zealand   总被引：1，自引：0，他引：1  

J.?R.?Campbell  D.?CrawEmail author  R.?Frew  T.?Horton  C.?P.?Chamberlain 《Mineralium Deposita》2004,39(4):437-451

A highly faulted and fractured rock mass has developed at the intersection of the Alpine and Hope faults, two major active faults in the South Island, New Zealand. The Alpine Fault is an oblique dextral reverse fault at the late Cenozoic-Recent Pacific-Australian plate boundary. The Hope Fault is a strike-slip fault parallel to the plate convergence vector. Hydrothermal fluids driven by the active tectonic processes have passed through the fractured rock mass, causing localised rock alteration and vein formation. Mylonites in the Alpine Fault zone are crosscut by cm-scale veins of quartz and/or ankerite with minor sulphides, with cemented breccias in dilational jogs. Breccia clasts and immediate (cm-scale) host rocks have been variably impregnated with carbonates and quartz. This generation of veins, breccias and altered rocks is post-dated by cataclasite and fault gouge zones which have been cemented by calcite, illite, smectite and chamosite. Ankerite and calcite have ¹⁸O between +10 and +30, and ¹³C between 0 and –8. These minerals are inferred to have formed from water with variable components of both meteoric and crustally exchanged fluid. Rock alteration associated with ankerite–quartz veins has added arsenic (up to 200 ppm As), strontium, and some Y to the rocks. Host-rock mylonites (<2 ppm As) have been depleted in arsenic compared to their precursors (5–15 ppm As). This depletion of arsenic in the middle crust provides the source for arsenic in shallower-level vein systems.Editorial handling: N. White  相似文献   

Gold mineralisation and alteration of Penakacherla schist belt, India, constraints on Archaean subduction and fluid processes     

C. Manikyamba  S. M. Naqvi  M. Ram Mohan  T. Gnaneshwar Rao 《Ore Geology Reviews》2004,24(3-4):199

In the Dharwar Craton, southern India, gold deposits are found mostly along the six arcuate shear zones passing through late Archaean greenstone belts (2.7 Ga). One such shear zone complex extends for about 400 km within and along the Ramagiri–Hungund schist belt. The Penakacherla sector of this shear zone is excellently exposed, enabling a detailed investigation of synorogenic gold mineralisation and its relationship to associated hydrothermal alteration.Metamorphism and deformation under NE–SW compression associated with Archaean subduction processes converted mafic volcanic rocks into amphibolites and intermediate to felsic volcanic rocks into quartz mica schists. Continued compression generated a 50–100-m-wide shear zone complex consisting of mafic phyllonites. Advection of hydrothermal fluids through this shear zone and reaction between fluids and the mafic phyllonites resulted in a silicified, K-metasomatic assemblage mainly consisting of chlorite, amphibole, K-mica, plagioclase, ankerite, quartz, Fe-oxides, pyrite, chalcopyrite and arsenopyrite. Networks of quartz and carbonate veinlets, a few millimeters to a few centimeters thick, formed along the foliation planes giving rise to microscopic alteration envelope, in which individual veinlet systems are merged into one another to form a composite alteration system. Gold is found within these quartz veinlets, mafic phyllonites and at their mutual contacts.Hydrothermal fluids have modified the primary major, minor, trace and LREE compositions of host rocks such that their mutual behaviour became non-systematic. Some HFSE and HREE also show minor mobility but the overall REE pattern generally resembles that of the precursor mafic volcanic rocks. Mass and volume loss/gain by Si and Ca has made significant impact on Al, Ti and Zr abundances, which are generally immobile during hydrothermal alteration. However, element pairs such as Zr–Hf, V–Sc and Nb–Ta maintain primary inter-element ratios, although their absolute abundances are drastically diluted. Similarly, ΣREE in highly silicified and carbonatised samples are reduced, but patterns remain similar to those of relatively least altered mafic phyllonites with (La_N/Yb)_N between 1 and 3. In some samples, LREE enrichment is observed elevating in (La_N/Yb)_N from 3 to 11. Pathfinder elements and base metals such as As, Cd, Cu, Pb, Zn and Sb have been added along with the Au and Ag.δ¹³C of carbon varies from −16‰ to −21‰ suggesting a biogenic origin, whereas coexisting pyrite δ³⁴S ranges from 1‰ to 3‰, pointing towards the involvement of magmatic or average crustal sulphur. Overall concentrations of K, Rb, Sr, Ba, Nb, Ta, Ti, Cs, Cr, Co, V, Y and Sc and many of the ratios such as K/Rb, La/Sc, La/Yb indicate that metamorphism, devolatilisation and dehydration of an oceanic subducting slab might have partially contributed the mineralising fluids and generated the alteration assemblage observed in the host rocks. Fluid sources were mantle and greenstone belt dehydration and devolatilisation generating observed compositional and alteration diversity.  相似文献   

川西北中生代特提斯沉积物地球化学特征对陆源风化条件的指示意义   总被引：1，自引：0，他引：1  

顾雪祥 《矿物岩石地球化学通报》1996,(1)

川西北中生代特提斯沉积物地球化学特征对陆源风化条件的指示意义顾雪祥（成都理工学院．成都６１００５９）关键词特提斯浊积岩，风化条件，元素分配型式，碱金属－碱土金属，化学变异指数地史时期的物源区现今许多已被剥蚀破坏，因而有关这类物源区的母岩性质、同化条件...  相似文献   

遥感找矿模型的研究进展与评述   总被引：2，自引：0，他引：2  

赵玉灵 《国土资源遥感》2003,14(3):1-4

在遥感找矿模型研究现状分析的基础上,对当前研究中存在的一些问题进行了探讨,指出遥感找矿模型的研究应注重矿床形成和保存两方面的信息,尤其是矿床保存方面的信息。遥感找矿模型是在当前技术条件下,描述一类矿床形成和保存的一系列遥感找矿标志的组合,应包括遥感地质找矿标志、遥感蚀变信息标志和矿床改造信息标志等几个方面的内容。  相似文献   

腾冲铜厂山矽卡岩型铅锌矿床   总被引：4，自引：0，他引：4  

吴绍军 《云南地质》2003,22(2):170-175

腾冲西北部滇滩—燕洞一带，燕山晚期花岗岩活动强烈，矽卡岩型矿床发育，形成众多铁、铜、铅、锌矽卡岩型矿床，是腾冲西北部重要成矿区，本文介绍的腾冲铜厂山矽卡岩型铅锌矿即是其中之一。矿床形成与燕山晚期黑云二长花岗岩关系密切，矿体位于上二叠统碳酸盐岩外接触带矽卡岩中。地层、岩石、构造对矽卡岩及矿体都有控制作用。最后提出矿床成因见解。  相似文献