摘要:1 Introduction The Ediacaran Doushantuo Formation at Weng’an, Guizhou Province, southwest China is famous for the well-preserved phosphatized Weng’an biota, including algae, large spinous acritarchs, filaceous and spherical Cyanobacteria, microtubular cnidarian, dubious sponges, resting eggs and embryos of animals, etc. Chen and Liu (1986) first reported a few phosphatized globular fossils and large spinous acritarchs after acetic acid maceration of the deposit. Since then, the phosphat…

摘要:1 Introduction In recent years, along with the regional 1:50000 geological mapping and establishment of the Yixian stage made by the Shenyang Institute of Geology and Mineral Resources, Ministry of Land and Resources as well as the research project on the Jehol Biota made by some institutions of China, a lot of animal and plant fossils have been found from the lower part of the Yixian Formation (Yixianian) in western Liaoning. The fossils are represented by the small theropod dinosaur S…

摘要:1 Introduction The Mazongshan area in northwestern China yields a diverse dinosaur assemblage, including members of Theropoda, Sauropoda, Ankylosauridae, Euornithopoda, and Ceratopsia (Dong, 1997; You, 2002). This assemblage is characterized by several well-established taxa, such as the basal neoceratopsian Archaeoceratops oshimai (Dong and Azuma, 1997; You and Dodson, 2003), the basal hadrosauroid Equijubus normani (You et al., 2003a), and the basal titanosaurian Gobititan shenzhouensi…

摘要:1Introduction The well exposed Hengshan terrain of the North China Craton(NCC)is situated in northern Shanxi Province,about250km WSW of Beijing(Fig.1),and is one of the classical areas of Archaean to Palaeoproterozoic geology of China.It is separated from the Wutai Mts.by the broad valley of the Hutuo River and is made up of the Heng Mts.,extending in a broad NE-SW trending belt and bounded by the valleys of the Sanggan and Hutou Rivers(Fig.1).The Heng Mts.constitute a typical hig…

摘要:1Introduction Regions of continental break-up are often associated with extensive magmatic activity(e.g.,White and McKenzie,1989).This commonly consists of huge volumes of basalts(flood basalts or rift-related basalts)and variable amounts of silicic volcanics,forming the so-called Large Igneous Provinces(LIPs).In most cases a wide silica gap occurs between silicic and basic compositions,defined as the Daly Gap,with small amounts or an absence of intermediate rocks(e.g.,Bellieni et al.,198…

摘要:1Introduction Due to its special properties and ubiquitous occurrence,zircon can be found in the crust,mantle,lunar rocks,meteorites,etc.And it is the ideal mineral to test the formation age of rocks(Xie et al.,2001).However,zircons are an exceptionally rare component of kimberlites.They have various sources and courses of formation.Zircons crystallized from kimberlitic magma are usually have large sizes and a maximum diameter of20mm was reported.Typically,they have low contents of U and Th,…

摘要:1Introduction Southeastern China is located at the junction between the Pacific plate and Eurasian plate,where Mesozoic granite and rhyolite are widespread and basaltic rocks cover less than5%of the area,with the gabbro and basalt usually occurring in association with granite and rhyolite,respectively(Zhou et al.,2002).A great deal of research has been done on granite and volcanic rocks,whereas basaltic rocks are less studied.Recently,the geodynamic significance of Mesozoic basaltic intrusio…

摘要:1Introduction The sedimentary basin is one of the hugest natural resource treasures for human beings with a transcendental incidence on our lives.Mckenzie(1978),Allen and Allen(1990),Dickinson(1993),Li(2000),Zhang et al.(2005),Yang and Zhang(2005)and others have studied such tectonic elements.Since the1980s,with the development of basin studies,people have gradually realized the important effects of fluid activity in basins on formation of metallic ore deposits.Basin’s fluid systems and th…

摘要:1Introduction Groundwater as a carrier and power of hydrocarbon migration and accumulation contains much important information about the formation and preserving conditions of oil and gas reservoirs.Therefore,for a long time,there are still many geologists using hydrochemical parameters to research the forming and distributing rules and the preserving conditions of oil and gas fields,which also important to evaluate the petroleum geologic characteristics in sedimentary basin,and then formed a …

摘要:Rheatian and Hettangian Ammonoid Assemblages from the Tibetan Himalayas and Their Pan-Tethyan Correlation YIN Jiarun(China University of Geosciences, Beijing 100083) On the basis of new collections from the Lanongla area, Nyalam County, Tibet, Rheatian and Hettangian ammonoid assemblages are recognized, including the Choristoceras marshi, Neophyllites-Choristoceras, Psiloceras calliphyllum and Discamphiceras pleuronotum assemblages. As the only Triassic and Jurassic boundary …

摘要:1. Papers should be devoted mainly to various aspects of research concerning geosciences and related disciplines in China, such as stratigraphy, paleontology, origin and history of the Earth, structural geology, tectonics, mineralogy, petrology, geochemistry, geophysics, geology of mineral deposits, hydrogeology, engineering geology, environmental geology, regional geology and new theories and technologies of geological exploration. Those of scientific interest to the geological community i…

摘要:1Introduction The Heyuan Basin is a fault basin,which was controlled by the main geological structures of the Heyuan Major Fault.It is one of the ten red basins in Guangdong Province,and occupies about725km2,extending from the southwest to the northeast.The northern part of the Heyuan Basin,here mentioned,is situated in the northern area of Datangpu Village.The shape of the northern part of the Heyuan Basin is crescent-like,in a north-northeast direction(Fig.1).The northern part of the …

摘要:1Introduction As one of the hazardous components of natural gas,the existence of H2S not only decreases the percentage of hydrocarbon gas within the natural gas and thus its industrial value,but also threatens each aspect of drilling and exploitation.In addition,H2S may cause serious accidents because of its strong toxicity and causticity that affects safety,which accordingly leads to higher exploration and production costs and the risk of natural gas with a higher H2S content.The contents o…