نتایج جستجو برای: carbonate replacement deposit

تعداد نتایج: 153195  

2017

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2001
YAYOI HONGO YOSHIYUKI NOZAKI

Although the rare earth element (REE) geochemistry of hydrothermal systems have intensively been investigated at mid-oceanic ridges, studies are relatively few at the converging plate zones like the Okinawa Trough. The “chimney” deposits obtained by using submersible “SHINKAI 2000” from the Iheya Ridge site, Okinawa Trough are largely composed of massive carbonates and silicates with minor amou...

علمدار, سیده محبوبه, رحیمی, بهنام , مظاهری, سید احمد ,

The study area is located about 30km northwest of Kashmar, southwest of Keriz village and east of Siah Kuh mine. Based on field and mineralogical studies, the rocks are mainly polutonic, sub-volcanic and volcanic, aged Eocene. The carbonate unit, with Permian age, is exposed extensivelly in the area. The mineralization in the area appears as veins, lenses, massive and dissiminated forms. Vein a...

Journal: :Geociências 2021

The Cabaçal deposit is located in SW Amazonian Craton, Mato Grosso State, Brazil, with important Au-Zn-Cu mineralization. ore hosted by the Alto Jauru orogenic rocks (1.79-1.74 Ga) comprised of felsic volcanic and volcanoclastic mineralizations occur as bands concordant mylonitic foliation, breccias, quartz-carbonate veins rock-disseminated, polymetallic comprises chalcopyrite, pyrite, marcasit...

2003
S. HAMMEN KARL M. WILBUR

Carbon dioxide fixation has not been studied extensively in the invertebrate animal groups. In an early study Van Niel et al. (1) with Cl1 showed fixation of COZ into succinic acid in the protozoan Tetrahymena geleii. Hultin and Wessel (2) studied incorporation of C% into proteins of developing sea urchin eggs (Psammechinus miliaris) with attention on metabolic patterns of development rather th...

Journal: :زمین شناسی اقتصادی 0
محمد معانی جو رحیمه سالمی

introduction there is an iron mining complex called shahrak 60 km east of takab town, nw iran. the exploration in the shahrak deposit (general name for all iron deposits of the area) started in 1992 by foolad saba noor co. and continued in several periods until 2008. the shahrak deposit comprising 10 ore deposits including korkora-1, korkora-2, shahrak-1, shahrak-2, shahrak-3, cheshmeh, golezar...

2009
Anicet Beauvais Gilles Ruffet

24 25 Chemical weathering and mechanical erosion are first order processes of long-term 26 tropical morphogenesis, which is still poorly deciphered for lack of time constraints. We 27 address this issue by laser-probe 39 Ar40 Ar dating of generations of cryptomelane [K128 2Mn8O16, nH2O] from the manganese ore deposit of Tambao in northern Burkina Faso. This 29 Mn deposit results from the superg...

2017
L.W. Maassen D.M. van Gastel E.G.W.M. Lentjes M.Y. Bongers S. Veersema

Objective To study the composition of intracavitary deposits on Essure® hysteroscopic sterilization devices. Design Case report. Setting Reproductive Medicine and Gynecology department of a University Hospital. Patients A 39 years old patient presenting with a request for surgical removal of Essure® sterilization devices. Diagnostic hysteroscopy showed a crystal like white deposit attache...

ژورنال: :پژوهش های دانش زمین 0
منصور عادپور دانشگاه شهیدچمران اهواز ایرج رسا دانشگاه شهیدبهشتی فریبرز مسعودی دانشگاه شهیدبهشتی مسعود حسینی کارشناس ارشد زمینشناسیاقتصادی، شرکت مهندسین مشاور زرناب اکتشاف، تهران

کانسار مس­گرماب در50 کیلومتری شمال­شرق شهرستان قائن، در قالب برگه زمین شناسی 1:100.000 آبیز و زون شرق­ایران واقع شده است. سنگ­های آتشفشانی­­کانسار مس­گرماب  به سن پالئوسن­ بالایی- ائوسن، شامل تناوبی از­گدازه­ها (آندزیت، تراکی­آندریت، آندزیت-بازالت و بازالت) و مواد­آذرآواری (انواع توف وآگلومرا) هستند. این سنگ­ها، بر اساس داده­های ژئوشیمیایی عناصر اصلی و­کمیاب، شباهت زیادی به­گدازه­های کالک­آلکال...

جمشیدی بدر, محبوبه , صالحی, زهرا , فرامرزی, نرگس سادات , مسعودی, فریبرز ,

Jarou deposit, with age of Middle Eocene –Oligocene, is located in 60 km to the southwest of Karaj and lies within magmatic rocks with felsic to basic composition. Host rock geochemical results have implied a calc-alkaline nature, magmatism related to an extensional back arc regime and lack of economic potential for igneous rocks. Petrographic and geochemical evidences of Cu minerals have shown...

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