Some structural assemblages resulted from the deep - position deformation in the earth crust and a reverse progressive metamorphic belt are developed in the Salebasi nappe, in which the genetic relationship among mylonite, migmatite and migmatitic granite is very important for studying the deformation and lithogenesis within the deep - position 'of the earth crust in compressive orogenic background.
Besides, the physical property of reservoir is influenced by lithologic characteristic and lithogenesis. If only analyze the data in the universal drill core and make statistic average, the method is definitely insufficient to represent the reservoir physical property, thus, particularly in this paper introduces the reservoir physical property and the relation with lithologic character in Leikoupo group and Jialingjiang group of Triassic system is studied and the lateral variation of fault and the factor determining the variation of the reservoir physical property is analyzed.
granites. Nd model age ranges from 1 400 Ma to 1 800 Ma with positive ε Nd(t) values, suggesting that plagio-monzonitic granitic gneisses are derived from juvenile crust,instead of from precambrian crystalline basement. Crystallization,lithogenesis,metamorphism and deformation took place simultaneously at 355 Ma±5 Ma.
Based on the fundamental principle of Strontium Isotope Stratigraphy (SIS), i.e. strontium isotope composition of seawater is a determined value during the same geological time, we can apply the SIS to the research of clastic diagenesis in order to estimate the effect of marine facies and non-marine facies on diagenesis.
Some sedimentary research fields in China, mainly including sedimentary environments and sedimentary systems, carbonate rocks, clastic diagenesis, sequence stratigraphy, sedimentary basin analysis and modeling, submarine sedimentation in the Chinese seas, oil-gas reservoir sedimentology and ore-deposit sedimentology, are briefly reviewed and prospected in the paper, which is dedicated to celebration of the twentieth anniversary of “Acta Sedimentologica Sinica”.
Ore minerals are predominantly represented by pyrite formed at an early diagenesis stage in conditions of hydrogen sulfide-bacterial paleoecosystems and repeatedly altered in the process of subsequent sediment transformation.
The formation of suspended manganese minerals in bottom waters is explained by an additional Mn supply from underlying reduced sediments during their early diagenesis and oxygen depletion in the near-bottom nepheloid layer.
Wide variations in the isotopic composition (from 41.4 to 18.1‰ for δ13C and from 11.7 to 33.5‰ for δ18O) point to different formation conditions in the early diagenesis zone and the later catagenesis zone.
Isotopic criteria for the identification of early diagenesis zone are proposed.
The transition from sedimentogenesis to diagenesis (upper boundary of the early diagenesis zone) is accompanied by the alteration of carbon isotopic composition in the HCO-3(hydrosphere)-HCO-3(pore water of sediment)system.
Evolution of Isotopic Carbon Dioxide-Water Systems in Lithogenesis: Communication 1.
Evolution of Isotopic Carbon Dioxide-Water Systems in Lithogenesis: Communication 2.
A comprehensive lithological-geochemical study of Neopleistocene-Holocene sediments from Russian Arctic showed that these sediments formed in rather similar sedimentation conditions, which were common for polar lithogenesis.
It is shown that the type of terrigenous rock alkalinity is governed by peculiarities of the tectonic evolution of sedimentary-rock basins and stages of lithogenesis.
It is shown that all types of continental lithogenesis are valid for placer formation, although each type can contribute some specific features to the placer-forming process.