نتایج جستجو برای: سن سنجی 40ar 39ar
تعداد نتایج: 60091 فیلتر نتایج به سال:
Syn-tectonic quartz veins are widely present in low- to medium-grade metapelitic belts, however, dating these is challenging due the lack of suitable target minerals for most geochronological methods. Andalusite a common K-poor aluminosilicate mineral veins. In this study, we demonstrate feasibility fluid inclusions andalusite using 40Ar/39Ar gentle stepwise crushing technique. Three samples sy...
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...
The existence of numerous iron meteorite groups indicates that some planetesimals underwent melting led to metal-silicate segregation, sometimes producing metallic cores. Meteorite paleomagnetic records suggest crystallization these cores generated dynamo magnetic fields. Here we describe the history partially differentiated IIE parent body. This is first planetesimal for which have a time-reso...
Accurate and precise dating is vital to our understanding of the Middle to Upper Paleolithic transition. There are, however, a number of uncertainties in the chronologies currently available for this period. We attempt to examine these uncertainties by utilizing a number of recent developments in the field. These include: the precise dating of the Campanian Ignimbrite (CI) tephra by 40Ar/39Ar; ...
The Ficoncella site in northern Latium (Italy) represents a unique opportunity to investigate the modalities of a short occupation in an alluvial setting during the Lower Palaeolithic. The small excavation area yielded a lithic assemblage, a carcass of Palaeoloxodon antiquus, and some other faunal remains. The main objectives of the study are to better characterize the depositional context wher...
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