Concretion

The investigation of epigenetic carbonate-hosted Pb-Zn deposits from China and Europe in the Eastern and Western orogens of the Tethyan Domain, have provided a new perspective on the range of processes operating in this deposit class globally. However, improved metallogenic models require new constraints on the timing of mineralization throughout the Domain. Mineralization is hosted by the Goushfil Main Fault and adjacent dolomitized limestones. The hydrothermal mineral assemblage comprises sphalerite, galena, pyrite, minor chalcopyrite and sulfosalt minerals, together with dolomite, barite and abundant quartz. Nonetheless, vein and replacement pyrites from the Goushfil orebody yielded a 5-point isochron age of The new mineralization age confirms an epigenetic origin for the Irankuh Zn-Pb deposit and supports an early onset for compressional deformation in the Zagros Orogen.

Pyrite Re-Os age constraints on the Irankuh Zn-Pb deposit, Iran, and regional implications

Mirnejad, H. Economic Geology, 4. ISSN Full text is not posted in this repository. Consult Related URLs below.

Many studies have undertaken Re–Os geochronology work on auriferous pyrites to date the age of gold deposits [4,5]. The Jinchang Deposit is.

A concretion is a hard, compact mass of matter formed by the precipitation of mineral cement within the spaces between particles, and is found in sedimentary rock or soil. The word ‘concretion’ is derived from the Latin con meaning ‘together’ and crescere meaning ‘to grow’. Concretions form within layers of sedimentary strata that have already been deposited. They usually form early in the burial history of the sediment, before the rest of the sediment is hardened into rock.

This concretionary cement often makes the concretion harder and more resistant to weathering than the host stratum. There is an important distinction to draw between concretions and nodules.

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Vernon, R. Precambrian Research , , pp. In the Archaean basement rocks of the Assynt and Gruinard terranes of the mainland Lewisian Complex in NW Scotland, a regional suite of quartz-pyrite veins cross-cut regional Palaeoproterozoic Badcallian, ca. The quartz veins are overprinted by amphibolite-greenschist facies Laxfordian deformation fabrics ca.

Seven ReOs ages were determined for molybdenite and pyrite samples from two well-dated Precambrian intrusions in Fennoscandia to examine the.

The study area is located at the southern end of the Gorouol greenstone belt, northwestern Niger. This region contains significant deposits of Copper and Molybdenum hosted in intrusive rocks metamorphosed in the green shale facies. This deposit was previously considered a porphyry system of Copper Cu and Molybdenum Mo without having been the subject of advanced research. The objective of this study is to confirm or refute this hypothesis and to date the mineralisation in an absolute manner in order to readjust the mineralising episode in the history of the West African Craton.

The methodology used within the framework of this study is the isotopic dating by the Re-Os method carried out on the pyrites of the host rock. This age range represents the West African Craton scale to an episode of magmatic accretion. During this accretion, the subduction phenomena between the Crusts Oceanic and Continental would have been favourable for the formation of the Cu and Mo mineralisation of Kourki.

Canadian Journal of Earth Sciences

The Kerman copper belt in Iran contains a number of important porphyry copper deposits, including Sarkuh and Iju. Molybdenite Re-Os isotope dating of the Sarkuh and Iju porphyry copper deposits shows that mineralization occurred at Compared with the previous Re-Os dating of molybdenite in the region, it is revealed that Cu mineralization was an ongoing process in an arc setting during the Miocene.

The available zircon dates of the granitic rocks from the Sarkuh The Re content 1,

acquired Re-Os dating in pyrite and molybdenite from Juruena gold deposit. The results show isochronous ages at ± 1 Ma, with a model.

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Research (Crustal Re-Os Geochronology)

E-mails: marapita1 yahoo. E-mails: mapabarros yahoo. E-mail: orestes. E-mail: mcnaughton curtin. E-mail: malc. Hydrothermal monazite grains formed during the Au mineralization event occur as fine anhedral crystals filling fractures or as isolated grains associated with Ag, Au, molybdenite, barite, pyrite, galena, and sphalerite.

Abstract—Re-Os isotopic analyses of a single organic-rich sedimentary rock unit (ORS) of known deposi- date for further evaluating the Re-Os geochronometer in ORS. 3. The Re and Os contents of diagenetic pyrite nodules associated.

The Yamansu iron deposit, hosted in submarine volcanic rocks, is located in the Aqishan-Yamansu Fe-Cu metallogenic belt of eastern Tianshan, Xinjiang. New pyrite Re-Os, and pyroxene diorite intrusion ages and the chemistry of magnetite constrain the origin of the deposit. The Yamansu orebodies display banded or lenticular forms and sharp contacts with marble and garnet skarn. Pyrite associated with magnetite from hydrothermal massive ores has a Re-Os isochron age of However, the pyroxene diorite age Magnetite samples from different ores in the Yamansu deposit are suggested to have a magmatic-hydrothermal origin.

Moreover, magmatic and hydrothermal magnetite samples show different characteristic normalized rare earth element REE and trace element patterns.

Dissecting the Re-Os molybdenite geochronometer

Institute of Geochemistry, Chinese Academy of Science. The Liaodong gold province, along the eastern margin of the North China craton, is a large productive base of gold in China. The Wulong gold deposit hosted in granitoid is a famous Au-bearing quartz vein gold deposit in this region, and located at the northern side of Sanguliu granite.

Keywords: Re–Os isotopic dating; Cu-Ni deposit; Geodynamic process; Hongqiling carbonate+pyrite+chalcopyrite assemblage that occurs as veins. Wall–rock.

Danny Hnatyshin, Robert A. Creaser, Jamie J. Wilkinson, Sarah A. Gleeson; Re-Os dating of pyrite confirms an early diagenetic onset and extended duration of mineralization in the Irish Zn-Pb ore field. Geology ; 43 2 : — Consequently, genetic models for ore formation are poorly constrained and remain controversial.

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JavaScript is disabled for your browser. Some features of this site may not work without it. Doctoral thesis. Metadata Show full item record. Collections Institutt for geovitenskap og petroleum [].

Re–Os dating of chalcopyrite, bornite, pyrite, pyrrhotite, arseno- pyrite rectly date the Cu ore formation age by the use of Re–Os isotopes.

The Campo del Cielo refers to a group of iron meteorites or to the area where they were found situated on the border between the provinces of Chaco and Santiago del Estero, 1, kilometers mi northwest of Buenos Aires, Argentina. Pallasites, a rare type of stony-iron meteorite, consist of olivine grains embedded in an iron-nickel metal matrix. If you are testing a potential meteorite with a magnet, first ensure that the magnet is not attached to any other metallic objects, then attach it to a piece of string.

The same is true for airplane parts and car parts, motorcycle parts all are found in the desert and other isolated areas now. With this information, we estimate the costs an These meteorites are composed of olivine crystals, similar to the piece of 4 Vesta that Ian Nicklin discussed above, that are embedded in a larger mass of iron-nickel. Many objects initially thought to be meteorites turned out to be space or aircraft junk, and even metallic pieces of wood chippers.

Reportedly a rare type of meteorite composed of iron, nickel, and gemstone, its value has been estimated at millions of dollars. It is routine to take an “authentication slice” from suspected meteorites to examine the interior. You may have found a meteorite but as you can see from the above, only hands-on examination and testing can give you a definitive answer if your sample is meteoritical or not.

Pyrite is usually seen in inexpensive jewelry, faceted in rose—cut fashion with flat backs, similar to the older marcasite jewelry popular during the Victorian era. According to Buchwald’s Handbook of Iron Meteorites, a “mass, of pounds, had been found half a mile from [the Dalton, Georgia, meteorite] about the year ; it was sent to Cleveland and described by Genth under the name ‘Cleveland’ Only 6 meteorites have been found in SC since while 9 lightening related fatalities were recorded in SC between – The Meteorites that have high iron levels assist the physical body in accepting, grounding, integrating and bonding with the spiritual sides of ourselves.

It is in the Museum of Rosario City, Santa Fe province, Argentina, where is exhibited in one of its square, in the open air.

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