Journal of China University of Geosciences最新文献_第7页

Megascopic Symmetrical Metazoans from the Ediacaran Doushantuo Formation in the Northeastern Guizhou, South China 黔东北埃迪卡拉纪陡山沱组大型对称后生动物

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60039-4

Wang Yue , Wang Xunlian , Huang Yuming

引用次数: 24

Compacting Deformation Engineering Characteristics of Weathered Soft Rock Mixture in Subgrade 路基风化软岩混合料压实变形工程特性

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60048-5

Li Xiaoqing, Jin Qingping

{"title":"Compacting Deformation Engineering Characteristics of Weathered Soft Rock Mixture in Subgrade","authors":"Li Xiaoqing, Jin Qingping","doi":"10.1016/S1002-0705(08)60048-5","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60048-5","url":null,"abstract":"<div><p>The engineering characteristics of weathered soft rock are important contents of soft rock mechanics. They also play a significant role in compacting deformation, which has been known to exert a significant amount of influence on the stability of highway filling subgrade engineering. In an effort to investigate this aspect of the problem, compacting tests and unconfined compressive strength tests have been carried out on weathered argillaceous slate and pelitic siltstone rocks, which are broken and graded before the test. The testing results indicate that the relationships of both between stress and strain and between axial strain and tangent modulus are exponential relationships; the size of the grain plays some influence on the deformation modulus, whereas the water content impacts the compressive strength greatly, which shows quadratic function; the unconfined compressive strength is linear with the dry density of loose soft rock mixtures. Therefore, the water content must be controlled in both the design and the construction of subgrade engineering of soft rock filling, and at the same time some effective measures should be taken to reach the requirement of compaction.</p></div>","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"19 3","pages":"Pages 298-306"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1002-0705(08)60048-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72247681","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Calculating Pollution Indices by Heavy Metals in Ecological Geochemistry Assessment and a Case Study in Parks of Beijing 生态地球化学评价中重金属污染指数的计算及以北京市公园为例

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60042-4

Gong Qingjie , Deng Jun , Xiang Yunchuan , Wang Qingfei , Yang Liqiang

{"title":"Calculating Pollution Indices by Heavy Metals in Ecological Geochemistry Assessment and a Case Study in Parks of Beijing","authors":"Gong Qingjie , Deng Jun , Xiang Yunchuan , Wang Qingfei , Yang Liqiang","doi":"10.1016/S1002-0705(08)60042-4","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60042-4","url":null,"abstract":"<div><p>Pollution index is a powerful tool for ecological geochemistry assessment. The commonly used pollution indices by heavy metals in soils and sediments were classified as two types of single index and integrated index in an algorithm point of view. Four single indices of contamination factor (or concentration factor), ecological risk factor, enrichment factor, and index of geo-accumulation were illustrated, and the reference values for calculating single indices were distinguished into background levels and threshold pollution values. Eight integrated indices were divided into two groups. One group is suitable for the normal distribution single indices including the sum, average, weighted average, vector modulus, and Nemerow pollution indices, and the other for log-normal distribution including the product, root of product, and weighted power product pollution indices. Using background levels as reference values, five contamination classes were divided, and the terminologies are suggested for the single and integrated indices to unify the assessment results. Software of EGAPI was developed in a single document interface to calculate the four single and eight integrated indices by heavy metals to assess the quality of soil and sediment ecological geochemistry. Pollution indices by heavy metals of Cu, Pb, and Zn in soils in parks of Beijing were calculated using EGAPI software, and these five contamination classes and terminologies suggested in this study were evaluated and used. Results of integrated indices of Cu, Pb, and Zn in soils indicated that the soil qualities are unpolluted as a whole and varied from low polluted to unpolluted status from the center to the outskirts of Beijing City.</p></div>","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"19 3","pages":"Pages 230-241"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1002-0705(08)60042-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72282759","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 392

Tectonics in the Northwestern West Philippine Basin 西菲律宾盆地西北部的构造

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60038-2

Ni Xianglong , Wu Shiguo , Shinjo Ryuichi

引用次数: 0

Tectonics in the Northwestern West Philippine Basin 西菲律宾盆地西北部的构造

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60038-2

Ni Xianglong, Wu Shiguo, S. Ryuichi

引用次数: 0

Calculating Pollution Indices by Heavy Metals in Ecological Geochemistry Assessment and a Case Study in Parks of Beijing 生态地球化学评价中重金属污染指数的计算及以北京市公园为例

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60042-4

Q. Gong, Deng Jun, Yunchuan Xiang, Qingfei Wang, Li‐Qiang Yang

引用次数: 386

Investigation of Curie Point Depth in Sulu Ultrahigh-Pressure Metamorphic Belt, Eastern China 苏鲁超高压变质带居里点深度研究

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60046-1

Qiao Qingqing, L. Qingsheng, Qiu Ning, F. Yuanyuan, Zhao Sutao, W. Yao, Y. Tao, Jin Zhen-min

引用次数: 6

Changes of the Hailuogou glacier, Mt. Gongga, China, against the background of global warming in the last several decades 全球变暖背景下贡嘎山海螺沟冰川近几十年的变化

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60045-X

He Yuanqing, L. Zongxing, Yang Xiaomei, Jia Wenxiong, He Xianzhong, Song Bo, Zhang Ningning, L. Qiao

引用次数: 32

Investigation of Curie Point Depth in Sulu Ultrahigh-Pressure Metamorphic Belt, Eastern China 苏鲁超高压变质带居里点深度的研究

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60046-1

Qiao Qingqing , Liu Qingsheng , Qiu Ning , Fu Yuanyuan , Zhao Sutao , Wu Yao , Yang Tao , Jin Zhenmin

{"title":"Investigation of Curie Point Depth in Sulu Ultrahigh-Pressure Metamorphic Belt, Eastern China","authors":"Qiao Qingqing , Liu Qingsheng , Qiu Ning , Fu Yuanyuan , Zhao Sutao , Wu Yao , Yang Tao , Jin Zhenmin","doi":"10.1016/S1002-0705(08)60046-1","DOIUrl":"https://doi.org/10.1016/S1002-0705(08)60046-1","url":null,"abstract":"<div><p>The Curie point depth of continental crust can reflect the regional tectonic pattern and geothermal structures. Analysis of magnetism is an efficient way to obtain the Curie point depth on a regional scale. This study systematically investigated the Curie point depth of Sulu ultrahigh pressure (UHP) metamorphic belt (33°40′N to 36°20′N and 118°E to 120°E, ca. 60 000 km<sup>2</sup>), eastern China using aeromagnetic data. The results show that the Curie point depth of the Sulu region varies from 18.5 to 27 km. The shallowest Curie point depth (ca. 18.5 km) is located in Subei subsidence, where the estimated temperature gradient value is about 31.35 °C/km, which is comparable with the measured value of 30 °C/km. In addition, a two-dimensional numerical solution of the heat conduction was used to calculate the temperature field to a depth of 30 km along the profile from Tancheng to Lianshui with a length of 139 km. The steady state model solved using the finite element method shows that the temperature around the Curie point depth is about 585.36 °C, which is close to the Curie temperature (580 °C) of magnetite at atmospheric pressure. These results provide new insights into the tectonic and continuous thermal structures of the Sulu UHP metamorphic belt.</p></div>","PeriodicalId":100762,"journal":{"name":"Journal of China University of Geosciences","volume":"19 3","pages":"Pages 282-291"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1002-0705(08)60046-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72282757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Megascopic Symmetrical Metazoans from the Ediacaran Doushantuo Formation in the Northeastern Guizhou, South China 贵州东北部埃迪卡拉系陡山沱组巨型对称后生动物

Journal of China University of Geosciences Pub Date : 2008-06-01 DOI: 10.1016/S1002-0705(08)60039-4

W. Yue, Wang Xun-lian, Huang Yu-ming

引用次数: 24