Results 41 to 50 of about 100,556 (325)

Rates of carbonate cementation associated with sulphate reduction in DSDP/ODP sediments: implications for the formation of concretions [PDF]

, 2004
DSDP/ODP porewater profiles in organic carbon-bearing (
Arvidson, Baker, Baker, Ben-Yaakov, Berner, Berner, Berner, Boetius, Boudreau, Boudreau, Buffle, Burton, Canfield, Canfield, Claypool, Claypool, Compton, Curtis, Devol, Devol, Drever, Fisher, Froelich, Gieskes, Gieskes, Hardie, Iverson, Luff, Middelburg, Morrow, Morse, Morse, Morse, Mozley, Mucci, Mucci, Mucci, Naehr, Q.J. Fisher, R. Raiswell, Raiswell, Raiswell, Raiswell, Raiswell, Raiswell, Raiswell, Raiswell, Rodriguez, Russell, Ruttenberg, Savrda, Thamdrup, Thamdrup, Toth, Tromp, Ullman, Van Cappellen, Van Cappellen, Walter, Zhong   +59 more
core   +1 more source

Precipitation mechanism of anhydrite cement in lacustrine tight sandstone: Implications for fluid activity, mass transfer and pore origin of open diagenetic system in tight sandstone

The Depositional Record, EarlyView.
This paper discusses a new model concerning the precipitation mechanismand significance of anhydrite cement in tight sandstone. Anhydrite cement ismainly formed by the dissolution and reprecipitation of early‐diageneticcalcite cements, feldspars and volcanic rock fragments at the mesodiageneticstage.
Long Luo, Meng Li, Shanzheng Tan, Xianfeng Tan, Xin Yu, Jon Gluyas, Jia Wang, Wei Jiang, Xuejiao Qu, Kangjun Wu, Yiting Gu   +10 more
wiley   +1 more source

Petrology and geochemical characteristics of dolomite in the Middle Permian Maoukou Formation, central Sichuan

Petroleum Research, 2017
Dolomites of the Maokou Formation in the central Sichuan were mainly developed in the middle-upper part of Member 2 and the lower part of Member 3 of Maokou Formation, it could be divided into fine-to medium-grained calcareous dolomite, fine-to medium ...
Jianqiang Liu, Haofu Zheng, Bo Liu, Hongguang Liu, Kaibo Shi, Rongtao Guo, Xuefeng Zhang   +6 more
doaj   +1 more source

Origin of the dolomite in the Buqu Formation (Mid-Jurassic) in the south depression of the Qiangtang Basin, Tibet: Evidence from petrographic and geochemical constraints

Frontiers in Earth Science, 2022
The Qiangtang Mesozoic sedimentary basin is a new field of hydrocarbon exploration, in which the Buqu Formation dolostone reservoirs have attracted increasing attention in recent years.
Youli Wan, Youli Wan, Jiashan Lin, Jiashan Lin, Zhan Zhao, Zhan Zhao, Zhonglin Wang, Zhonglin Wang   +7 more
doaj   +1 more source

Sequence stratigraphy, chemostratigraphy and facies analysis of Cambrian Series 2 – Series 3 boundary strata in northwestern Scotland [PDF]

, 2016
Globally, the Series 2 – Series 3 boundary of the Cambrian System coincides with a major carbon isotope excursion, sea-level changes and trilobite extinctions.
Faggetter, Luke, FAGGETTER, LUKE E., Joachimski, Michael, JOACHIMSKI, MICHAEL M., NEWTON, ROBERT J., Pruss, Sara, PRUSS, SARA B., Raine, Robert, RAINE, ROBERT J., Smith, Paul, SMITH, PAUL M., SUN, YADONG, WIDDOWSON, MIKE, Wignall, P B, WIGNALL, PAUL B.   +14 more
core   +1 more source

Experimental and constitutive modeling investigations on marble in Jinping Underground Laboratory

Deep Underground Science and Engineering, EarlyView.
The objective of this study is to reveal the underlying mechanisms behind the brittle‐ductile transition of the marble through a combination of experimental research and constitutive modeling. A series of triaxial compression and triaxial cyclic loading tests are conducted.
Susheng Wang, Qiang Zhang, Hao Luo, Zhinan Lin   +3 more
wiley   +1 more source

Microstructure analysis and mechanical parameter estimation of sanding dolomite

Frontiers in Earth Science
Sanding dolomite strata are widely distributed in southwest China. The safety of the water diversion tunnel in Yuxi section of the Central Yunnan water diversion Project has been seriously threatened by the geological disasters such as the reduction of ...
Fengnian Wang, Fengnian Wang, Fengnian Wang, Fengnian Wang, Zewei Li, Zewei Li, Yongxiang Shi, Yongxiang Shi, Xiaowen Gong, Yanjie Zhang   +9 more
doaj   +1 more source

Petrography of Jutana Dolomite: Implications for Geotechnical Utility [PDF]

International Journal of Economic and Environment Geology, 2018
Present study has been carried out to know the reliance of mechanical properties on the petrographic parameters. The Jutana dolomite is comprised of dolomite, sandy dolomite and siliciclastic beds.
Mustafa Yar, Umer Jabbar Khan, Mian Gulzeb Joya, Muhammad Saqib Javed   +3 more
doaj  

Probability prediction of true‐triaxial compressive strength of intact rocks based on the improved PSO‐RVM model

Deep Underground Science and Engineering, EarlyView.
In this work, we propose an improved particle swarm optimization (PSO) algorithm and develop an improved PSO‐relevance vector machine (RVM) model as a substitute for traditional true‐triaxial testing. The model's high prediction accuracy was validated through comparisons with two other machine learning methods and five three‐dimensional Hoek–Brown type
Qi Zhang, Maohui Wang, Ning Wang, Yixin Shen, Xuzhen He   +4 more
wiley   +1 more source

Hydrothermal dolomite reservoir facies in the Sinian Dengying Fm, central Sichuan Basin

Natural Gas Industry B, 2017
The Upper Sinian Dengying Fm is the focus of natural gas exploration in the central part of the Sichuan Basin (central Sichuan Basin) in recent years.
Yuqiang Jiang, Yifan Gu, Xun Zhu, Wei Xu, Yao Xiao, Junliang Li   +5 more
doaj   +1 more source