检索结果-南通市图书馆

Acta Geologica Sinica(English Edition) 1996年第3期70卷 260-273页

作者： Xue Huaimin, Tao Kuiyuan and Shen JialinNanjing Institute of Geology and Mineral Resources, Chinese Academy of geological Sciences, Nanjing, Jiangsu Jiang Minxi Nanjing Institute of Geology and Mineral Resources Chinese Academy of Geological Sciences Nanjing Jiangsu

The Mesozoic volcanic rocks in the coastal region of southeastern China were superimposed on some different basement tectonic elements. The volcanic rocks developed in these different basement tectonic elements have great differences in Sr and Nd isotopic compositions. The rocks in western Zhejiang and northeastern Jiangxi Provinces which belong to the Lower Yangtze subplate have lower initial 87Sr/ 86Sr ratios, but are higher in initial Nd isotopic ratios. The initial 143Nd / 144Nd values of the volcanic rocks developed in the Cathaysian subplate increase clearly from early to late in time, and from the core of the Wuyishan uplift coastwards constantly, but the initial 87Sr/86Sr values tend to decrease. The isotopic characteristics and their spatial variations in Mesozoic volcanic rocks in the study region are, to a great extent, manifestations of the isotopic characteristics in basement metamorphic complexes, and the generation of the Mesozoic acid magma in this region is attributed to the recycling of pre-existing crustal materials.

关键词： Nd Sr and Nd Isotopic Characteristics and Magma Genesis of Mesozoic Volcanic Rocks Along the Coastal Region of Southeastern China

The Evolution of Alpine Ultramafic Rocks and Partial Melting of the Upper Mantle

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 1993年第1期67卷 43-61,122页

作者： Bao Peisheng, Wang Xibin, Hao Ziguo and Peng Genyong Institute of Geology, Chinese Academy of geological Sciences, Beijing Fei Zhenbi Institute of Geology Chinese Academy of Geological Sciences Beijing

Ultramafic rocks of Tibet and Xinjiang are the products of partial melting of the upper mantle. The evolution of their mineral composition is marked by two parallel evolutionary series: one is the progressive increase of the 100 Mg/(Mg+Fe^(2+) ratio of silicate minerals in order of lherzolite→harzburgite→dunite, i.e. the increase in magnesium; the other is the increase of the 100 Cr/(Cr+Al) ratio of accessory chrome spinel in the same order, i. e. the increase in Chromium. The above-mentioned evolutionary trends are contrary to that of magmatic differentiation. The evolution of fabrics of ultramafic rocks is characterized by progressive variation in order of protogranular texture→melted residual texture, symplectic texture and clastophyritic texture→equigranular mosaic texture and tabular mosaic texture. Experiments of partial melting of lherzolite have convincingly shown that the evolution of Alpine ultramafic rocks resulted from the partial melting of pyrolite. Various subtypes of them represent different degrees of partial melting. The vertical zoning marked by more basic rocks in the upper part and more acid rocks in the lower actually belongs to the fusion zoning of pyrolite.

关键词： Alpine ultramafic rocks upper mantle partial melting

A new conception on the formation of the first bend of Yangtze River: its relations with Eocene magmatic activities

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical Sciences 2002年第3期12卷 305-312页

作者： ZENG Pusheng(Inst. of Mineral Resources, Chinese Academy of geological Sciences, Beijing 100037, China) Inst. of Mineral Resources Chinese Academy of Geological Sciences Beijing China

Based on field observations, the author proposes a new understanding on the formation of the first bend of the Yangtze River. The relationship between the formation of the first bend of the Yangtze River and Eocene magmatic activity is expounded, suggesting that the first bend of the Yangtze River is the result from choking of the strong magmatic activity in Eocene. As a result, the upstream became a natural reservoir, whose riverside between Mt. Yulong and Mt. Haba was burst, guiding Jinshajiang River running eastward. At the same time, the drastic uplift of the Qinghai-Tibet Plateau led to the deep dissection of the river cut down the channel, resulting in the formation of the Tiger Leaping Gorge. The magnitude of uplift in the study area (located in the eastern of the Tibetan Plateau) is calculated. Taking Mt. Yulong as a base, the magnitude of lift is 3,300 m from Eocene to Pliocene, adding 700 m since Pleistocene, totaling up to 4,000 m or so.

关键词： magmatic activity choking channel bursting Laojunshan Mt Yunnan the first bend of the Yangtze River

Development of Zr/ZrO_2 high temperature and high pressure sensors for in-situ measuring chemical parameters of deep-sea water

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2009年第8期52卷 2466-2473页

作者： ZHANG XueTong, ZHANG RongHua, HU ShuMin & WANG Yong Open Research Laboratory of Geochemical Kinetics, Institute of Mineral Resources, Chinese Academy of geological Sciences, Beijing 100037, China Open Research Laboratory of Geochemical Kinetics Institute of Mineral Resources Chinese Academy of Geological Sciences Beijing 100037 China

In order to in situ measure chemical parameters of deep-sea water and hydrothermal fluids at midocean ridge(MOR), it is necessary to use high temperature and high pressure chemical *** new sensors is essential to measure in-situ pH and other chemical parameters(dissolved H2, dissolved H2S) of deep-sea water and hydrothermal fluids in a wide temperature range(2℃―400℃) at MOR *** YSZ(Yttria Stabilized Zirconia, 9%Y2O3) ceramic-based(HgO/Hg) chemical sensors possess excellent electrochemical properties at high temperatures, which have been used to measure chemical parameters of hydrothermal fluids above 200℃.A novel Zr/ZrO2 oxidation/reduction electrode was constructed by oxidation of Zr wire in Na2CO3 *** Zr/ZrO2 electrode has good chemical stability while measuring pH of high-temperature aqueous solutions, combined with a Ag/AgCl reference *** of the Zr/ZrO2 sensor in association with a Ag/AgCl reference electrode vary linearly with pH over a wide pH range, as tested by various NaCl-HCl-H2O solutions(NaOH-NaCl-H2O for basic solutions), at temperatures in the range of 20℃―200℃.Thus, the Zr/ZrO2 sensors can be utilized in monitoring the fluids over the temperature range of 2℃―200℃.The Zr/ZrO2 electrode combined with Ag/AgCl, Ag/Ag2S, and Au electrodes has been used to measure pH and other chemical parameters(dissolved H2, dissolved H2S) of aqueous fluids from low to high temperatures and high pressures in the laboratory and to monitor those parameters of deep-sea water in South China Sea.

关键词： Zr/ZrO2 sensor melt oxidation method high temperature and high pressure chemical parameters investigation in the deep ocean

Notes on Two New Ordovician Trilobites

在线全文

学校读者我要写书评

暂无评论

地质学报 1938年第2期 137-154+200-202页

作者： Y.WANG (geological survey of China)

While surveying the underground water resources in northwesternHonan in the winter of 1933,the writer accompanied by *** and ***,gave special attention to the collecting of fossils from the wide-spreadMiddle Ordovician Machiakou *** our collections thereis a single specimen of trilobite which is described in the present *** addition to the trilobite,there are cephalopods,crinoids and stroma-toporoids which still await identification.

关键词： view Notes on Two New Ordovician Trilobites

Response to“Discussion on the systematic position of the Early Cambrian priapulomorph worms”

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2006年第2期51卷 250-256页

作者： HAN Jian1 & HU Shixue2 1. Department of Geology and Key Laboratory for Continental Dynam- ics of the Education Ministry, Northwest University, Xi’an 710069, China 2. Yunnan geological Institute, Kunming 650011, China Department of Geology and Key Laboratory for Continental Dynamics of the Education Ministry Northwest University Xi’an China Yunnan geological Institute Kunming China

Due to the combination of complex states of preservation and taphonomies inChengjiang fossils, Huang et al.) expressed different opinions to those of Han et al.) on themorphology and systematic position of the fossil priapulomorph worms (Priapulomorpha) based on theiradditional materials. These diverse opinions are critical in any investigation of the diversity ofthe Introverta in the Cambrian explosion. However, some of their ideas need to be discussed infurther detail.

关键词： Response to Discussion on the systematic position of the Early Cambrian priapulomorph worms

Graptolite Faunas from the Wufeng Shale

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

地质学报 1945年 201-209+337页

作者： A.T.Mu (geological survey of China)

with 1 plate The graptolites listed below were collected by members of the Nationalgeological survey and of the geological survey of Szechuan from the

关键词： Graptolite Faunas from the Wufeng Shale

The Lower Silurian Trilobite Encrinurus (Coronocephalus) rex,its Geographical Distribution and Stratigraphical Position

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

地质学报 1938年第1期 9-32+116页

作者： Y.WANG (geological survey of China)

INTRODUCTION In the appendix of the"Stratigraphy of China,"Part I,***（4）;figured a restoration of a Lower Silurian trilobite underthe new subgeneric name"Coronocephalus"on the basis of separated

关键词： In The Lower Silurian Trilobite Encrinurus Wang

Ordovician-Silurian Boundary Extinction and Its Relationship to Iridium and carbon Isotope Anomalies

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 1990年第1期64卷 81-92页

作者： Wang Xiaofeng Chai Zhifang Yichang Institute of Geology and Minieral Resources, Chinese Academy of geological Sciences, Yichang. Hubei Institute of High Energy, Academia Sinica, Beijing Liu Linqun Yichang Institute of Geology and Mineral Resources Chinese Academy of Geological Sciences Yichang Hubei China

The abundance distributions of more than 40 elements in the No. 502 Ordovician-Silurian (O/S) bounda-ry section at Fenxiang, Yichang have been studied by RNAA and INAA. The results show that in the bounda-ry bed, there is a distinctive Ir anomaly because the Ir concentration abruptly increases to 0.64 ppb.Furthermore, the Ir is positively correlated in abundance variation with some siderophile and sulphophile ele-ments. In the same bed of the O/S boundary section at Huanghuachang, Yichang, there is also a δ^(13)C excur-sion. These geochemical signs support the hypothesis that the terminal Ordovician mass extinction was proba-bly related to extraterrestrial event, and provide new evidence for defining the O/S boundary between theHirnantia-Kinnella and G. persculptus Zones.

关键词： Ordovician-Silurian Boundary Extinction and Its Relationship to Iridium and carbon Isotope Anomalies Chen Wang