نتایج جستجو برای: clastic rocks
تعداد نتایج: 22678 فیلتر نتایج به سال:
The lunar regolith breccia Dhofar 1769, which was found in 2012 as a single 125 g piece the Zufar desert area of Oman, contains relatively large, dark-colored impact melt embedded fine-grained clastic matrix. internal texture fragment indicates repeated formation on surface, their brecciation, and mixing second, third, fourth generations brecciated rock types. chemical mineralogical data reveal...
A new ichnospecies of the ichnogenus Funalichnus Pokorný is described from the Middle Bhuban Unit, Bhuban Formation, Surma Group (Lower - Middle Miocene) of Aizawl, Mizoram, India. Funalichnus bhubani isp. Nov. Is a large burrow displaying cylindrical segments that are oriented nearly perpendicular to the bedding plane. The new ichnospecies can be identified on the basis of general form, size, ...
The Sava depression represents the most southern part of the Pannonian basin (Fig. 1). After the Middle Eocene, a long continental phase started in the area represented by the present depression, during which tectonic movements occurred and a fault network was created along which the basin subsided by extension. The oldest proven sediments belong to the fresh-water Ottnangian deposits which are...
Preferred orientation of minerals hitherto has been studied almost exclusively in metamorphic and igneous rocks, which show the most spectacular effects of deformation or magmatic flow. In sediments, preferred orientation of grains controlled by their shape has been discussed by Sander,' but to our knowledge no one has ever reported preferred orientation produced by deformation under diagenetic...
The Cryogenian–Ediacaran strata in the Kuruktag block, northeastern Tarim Craton, are pivotal for deciphering breakup of Neoproterozoic Rodinia and related peripheral subduction processes. This study reveals previously unidentified Ediacaran western characterized by deltaic plain clastic rocks channel deposits. Zircon geochronological analyses basalts sandstones indicate a maximum depositional ...
Plagioclase-bearing rocks were first detected in the vicinity of large impact basins on Mars using visible/near-infrared (VNIR) data. The geologic context is consistent with excavated plutons or ancient crustal outcrops. Our analyses reveal plagioclase outcrops exposed a 200 m thick, sub-horizontal layer 8 km deep walls Valles Marineris canyon. These plagioclase-bearing are either sill, volcano...
Geological structure and age of the volcanogenic-sedimentary complex Cape Svyatoi Nos (Svyatonosskaya formation) are presented. The rocks located on border Novosibirsk-Chukotka Verkhoyansk–Kolyma fold belts, coast Laptev East- Siberian Seas. Field studies indicate that belong to a single complex. maximum thickness individual sections reaches up 700 m. Coarse-grained pyroclastic with rare lava f...
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