Abstract:Jinxi-Nancheng metamorphic migmatite zone composed mainly of Jinxi igneous mass amd controlled by various ductile shear zones is a multi-facies, multi_type and progressive metamorphic zone. On the basis of a comprehensive petrological and mineralogical study of Jinxi_Nancheng metamorphic migmatite zones, their Nd-Sr-Pb-O isotopic geochemistry hasbeen investigated in detail. The initial Nd and Sr isotopic compositions of migmatites and granites are 0.511689~0.511853 and 0.74864~0.75257 respectively.δ18O values of migmatites and granites are 10.23‰~14.89‰, similar to theδ18O values of high O granites(>10‰).Below the evolution line of sericite schist of folded_basement in theεNd-Tevolution diagram,initial Nd isotopic composition of migmatites and granites is apparently located in the evolutionarea of granulitite and schist of crystalline-basement. Their contents of radiogenic Pb are relatively low, withμbeing 10.07~10.4, and their Pb isotopic compositions are above the evolution line of the upper crust. The above features show that migmatites and granites in JinxiNancheng migmatite zone are formed by partial remelting of O_rich and highly_matured granulitite and schist.

Abstract:In the Mesozoic basaltic rocks from northern Guangxisouthern Hunan, there are abundant deep-source enclaves, which can be divided into peridotite, gabbro and intermediate-acid gneiss. Based on petrology and geochemistry of these rocks, the present paper indicates that Mesozoic basaltic rocks are products of partial melting of peridotite instead of being related to gabbro and intermediate-acid gneiss which are merely accidental enclaves. It is noteworthy that gabbro and gneiss in these deep-source enclaves show genetic connection of fractional crystallization. They are evolutionary products of underplated basaltic magma, which was intruded between the crust and the mantle in Proterozoic. The gabbro is of the cumulus phase of underplated magma, whereas the gneiss is the product of residual magma after the fractional crystallization of underplated magma.

Abstract:Tiaojishan Formation in Western Hills of Beijing was dated at Late Jurassic based on the Ar-Ar ages for tachyandesites (all plateau ages and isochrone ages of plagioclase are respectively 148.91±2.98 Ma and 146.60±2.93 Ma). Geochemistry of elements and isotopes shothat volcanic rocks of Tiaojishan Formation are mainly of high-K calc-alkaline series characterized by indistinct Eu anomaly, relative enrichment of large-ion lithophile elements such as.Rb,Sr and Ba, relative depletion of high field-strength elements (e.g. Nb, Ta, Ti, Zr, Hf ), and low Nd, Sr and Pb ratios, suggesting the features of island -arc and active continental margin and enriched mantle. The authors think that volcanic rocks of Tiaojishan Formation were derived from partial melting of old-age (Archean) basaltic rocks of the lower crust and the crustmantle transitive zone by the underplating of basaltic magma during intrcontinental orogeny

Abstract:The high-pressure metamorphic rocks in northeastern Jiangxi Province include such types of rocks as jadeite-bearing aegirine-augite albite amphibole schist, jadeite-bearing aegirine-augite quartz albitite, aegirine-augite-bearing amphibole quartz albitite, aegirine-augite-bearing albite amphibole schist, winchite quartz albitite, and magnesio-riebeckite quartz albitite. Mineral constituents consist mainly of jadeite, aegirine-augite, magnesio-riebeckite, winchite, magnesio-hornblende, actinolite, quartz, albite, rutile and sphene. The high-pressure metamorphic rocks underwent an isothermal decompressional retrograde process after the peak metamorphism.

Abstract:From Cretaceous to Tertiary, the Tarim basin developed many types of sedimentary facies. There are marine, non-marine and transitional facies distributed over this area. The Upper Cretaceous-Paleogene marine deposits are scattered mainly over the foothills of West Kunlun to Southwest Tianshan Mountains in the southwestern depression of Tarim basin, but do not occur in the northeastern depression of Tarim basin. The Lower Cretaceous-Miocene strata mainly have non-marine deposits. According to an integrated analysis of the features of sedimentation, rocks and minerals, organism and geochemistry, the Cretaceous-Tertiary deposits in Tarim basin can be divided into 3 sedimentary facies groups, 12 sedimentary facies, 20 sedimentary subfacies and a certain number of sedimentary microfacies, and the Late Cretaceous marine deposits have been found for the first time in the northern Tarim basin. From Cretaceous to Tertiary there were developed two kinds of reservoirs in Tarim basin?clastic reservoirs and carbonate reservoirs. The reservoirs in the northwestern depression of Tarim basin are mainly clastic rocks. The Lower Cretaceous Yageliemu Formation of Kapushaliang Group, in particular, is a significant reservoir in Shaya uplift, and the Upper Cretaceous Bashijiqik Formation is an important reservoir in Kuqa foreland basin. The reservoirs in the southwestern depression include clastic reservoirs and carbonate reservoirs. The sandstone and conglomerate of the upper Lower Cretaceous Wulukeqiate Formation, the bioherm limestone of the Upper Cretaceous Yigezia Formation in the front of the foothills of west Kunlun can also form fairly good reservoirs.

Abstract:Through the infrared spectroscopic and electron microprobe analysis of the small-scale 6th rhythmic unit, the content of catios and anions was determined. The result shows that the content of major elements rise and fall indistinctly while F- in the apatite near the bottom of No.3 orebody was replaced by Cl-, forming chlorapatite. This seems one of the reasons for the inversely graded layers and the rhythmic structure of the layered rocks in the Fanshan igneous complex.

Abstract:Sapphires from Mingxi were investigated by such means as chromatic measurement, EPR, IR and TGA-DTA. It has a dark color mixed with yellow color and strong dichroism. The spectra obtained show that Fe3 is the main form of the Fe atoms, d-d leap of Fe3 and charge transfer are the main factors causing the formation of colors. The content of H is an important factor in the formation of blue color.

Abstract:This paper has described a method for synthesizing the potassium_expanded graphite intercalation compounds (K_EGICS), and discussed the electronic characteristics of expanded graphite and K_EGICS. It is found that electrical conductivity of K_EGICSgets smaller with the rising temperature (the electric conductivity decreases from 5.05×101S·cm-1to 2.35×101 S·cm-1when temperature rises from 77 K to 577 K), together with the elevation of graphite s EC (the electric conductivity goes up from 2.48×102S·cm-1to 5.769×102S·cm-1). The probable reasons for differences between expanded graphite and K_EGICSare also investigated.

Abstract:The central part of Sanjiang region can be divided into Yangtze(_phile) geochemical province and Gondwana(_phile) geochemical province. In the former province, the upper mantle rocks consist of harzburgite and lherzolite, characterized by the concentration of mantle type elements (KT) and the smooth_weak enrichment type REE patterns; the ocean volcanic rocks are dominated by basic rocks of subalkaline and oceanic ridge type; lead isotopes are noted for 206Pb/204Pb<18.5,208Pb/204Pb<38.65,μ<9.35,ω<38.60, V1<75 and V2<65. In the latter province, the upper mantle rock is mainly harzburgite characterized by impoverishment of mantle type elements ( KT) and the weak enrichment type REE patterns ; the ocean volcanic rocks are comprised of ultrabasic, basic and intermediate_basic rocks, being both subalkaline and alkaline in nature and assuming both oceanic island type and oceanic ridge type; the characteristic lead isotope values are all higher than the bove_mentioned values.

Abstract:Located on the Shangdan tectonic zone, the Danfeng Group complex in the East Qin- ling mountains was on whole formed in Newproterozoic (1 000~800Ma). Petrogeochemical characterisitics of metabasic volcanic rocks within the complex of this group show that, instead of being ophiolite, they are island_arc type volcanic rocks formed in an active epicontinental paleoisland-arc tectonic environment under the plate tectonic system of Newproterozoic main orogenic epoch in Qinling orogenic belt.

Abstract:Using ICP-AES, EMPA and mineral magnetic measurement, the authors systematically analysed the mine waste and the surrounding soil of iron sulfide waste ore dump at Jiguanshan, Tongling. The results show that variations in heavy metal contents differ in different samples. Two mining waste sections with abandonment time being ten years (Section XO) and six years (Section XM) respectively exhibit an enrichment-leaching-enrichment model, while the section with abandonment time of three years (Section XN) shows an enrichment-leaching model. Taking migration into account, it is demonstrated that the heavy metals have potential impact on eco-environment. Researches on the magnetic susceptibility were also carried out to evaluate its relationship with heavy metal enrichment .In fact, there exists a close relationship between them. It is therefore considered that magnetic susceptibility is an effective indicator for variation in heavy metal concentrations, and may serve as a new method for studying heavy metal pollution.

Abstract:Dalian area has undergone a long and specific geological-structural evolutionary process. The study area has been the structural background of active continental margin since Mesozoic, and has suffered the influence of multideformation, in which the NS-trending shear traction deformation is the largest and most widespread in scale. This paper has determined the characteristics as well as the model and age of the deformation on the basis of geological investigation. The results obtained have enriched the research substance of Indosinian movement in Sino-Korean plate.