The Luconia Province-offshore Sarawak-is a key geological unit for understanding the distribution of hydrocarbon resources in Malaysia. Nevertheless, little effort has been made to address the palaeoenvironmental char...The Luconia Province-offshore Sarawak-is a key geological unit for understanding the distribution of hydrocarbon resources in Malaysia. Nevertheless, little effort has been made to address the palaeoenvironmental characteristics of the Tertiary carbonates in the key sector of Central Luconia.We study the sedimentology and petrography of core samples from a well in Central Luconia, for which thirteen microfacies have been identified reflecting different depositional settings. This is the first microfacies scheme elaborated for Luconian carbonates. Lithofacies and microfacies distribution are compatible with deposition in a reef complex, originating around a framework reef, within the euphotic zone. Sediments were deposited in environments of backreef, reef crest, and forereef. The fair weather wave base is marked by the presence of coralline red algae, foraminifera, decreasing degree of bioclast fragmentation and other microfacies features. As a result, a depositional-environmental model is constructed, depicting a reef complex built around a framework reef developed on the margin of an isolated platform. In addition, an innovative, preliminary time series analysis of facies, microfacies and depositional environment data reveal the existence of seasonal cycles in the stacking patterns of facies and microfacies.展开更多
On the basis of the sound velocity measurements of the coral reef core from Nanyong No. 1 Well of Yongshu Reef in the Nansha Islands, the paper studies the relations between the vertical sound velocity transition feat...On the basis of the sound velocity measurements of the coral reef core from Nanyong No. 1 Well of Yongshu Reef in the Nansha Islands, the paper studies the relations between the vertical sound velocity transition features in the coral reef core and the corresponding stratigraphic depositional facies change as well as stratigraphic gap of erosion, analyses the cause of the sound velocity transition, expounds the concrete process of the sea level change resulting in the stratigraphic gap of erosion and facies change in the coral reef and explains the relations between the vertical sound velocity transition in the coral reef core and the corresponding stratigraphic paleoclimate and the sea level change. This study is of important practical value and theoretical significance to the island and reef engineering construction and the acoustic logging for oil exploration in the reef limestone area as well as the paleoceanographic study of the marginal sea in the western Pacific Ocean.展开更多
The bio reef chert suite is an important ore bearing rock assemblage and one of the metallogenic rock suites of superlarge ore deposits. It is formed as a fixed and ordered suite in space and time, and composed of dif...The bio reef chert suite is an important ore bearing rock assemblage and one of the metallogenic rock suites of superlarge ore deposits. It is formed as a fixed and ordered suite in space and time, and composed of different rocks formed by different geological processes. It is the product of basin evolution at special stage in a special geological setting. It is also the comprehensive product of normal sedimentary process, biological process in basin, hydrothermal sedimentary process under basin base and magmatic process in the deep lithosphere.展开更多
This study focuses on the close association between Devonian reefs and the strata-bound ore deposits in South China.For the first time,the development of Devonian reefs was subdivided into three stages,respectively as...This study focuses on the close association between Devonian reefs and the strata-bound ore deposits in South China.For the first time,the development of Devonian reefs was subdivided into three stages,respectively as the initial,succeeding and peak stages,and its evolution model is proposed.In Dachang,Nandan county,Guangxi Zhuang Autonomous Region(Guangxi for short),a large-scale strata-bound ore deposit formed in a Devonian reef,which was affected by marine volcanic activities and Mesozoic magmatic intrusions.The reef-building reached its peak stage at the Givetian,indicating a large-scale build-up of reef and inter-reef depression.In central-eastern Hunan Province,the strata-bound ore deposits belong to low-temperature ore-types without later magmatic intrusions or volcanic activities.In Hunan Province as well as many other localities in South China,the Givetian reefs played important roles in mobilizing ore-forming materials from the surrounding pre-Devonian rocks,providing spaces and passages for transporting hydrothermal fluid,and progressing mineralization and accumulation of ore-forming materials.展开更多
THE reef-chert suite, named by Chen, mainly consists of four types of rocks, with reef carbonate in thelower part, fine detrital rocks in the upper part, chert beds with ore bodies in the intermediate, and synchronous...THE reef-chert suite, named by Chen, mainly consists of four types of rocks, with reef carbonate in thelower part, fine detrital rocks in the upper part, chert beds with ore bodies in the intermediate, and synchronous volcanic rocks either in this sequence or in the same sequence in the neighboring district. It isformed as a fixed and ordered suite in space and time, and is the comprehensive product of normal sedimentary process, biological process in extensional basin, hydrothermal sedimentary process near basinbase and magmatic process in the deep of lithosphere in the special geological setting. Many of thesediment-hosted ore deposits usually occur in such a suite in China, such as Dajiangping pyrite deposit,Shuikoushan lead-zinc ore deposit, Changkeng gold-silver deposit, Dachang cassiterite-lead-zinc ore deposit, Xikuangshan stibium ore deposit, Changba-Lijiangou lead-zinc ore deposit, Baiyunebo展开更多
基金financial assistance throughout the research under the grant YUTP 0153AAA14financial support from UTP through the grant URIF 2014-00735
文摘The Luconia Province-offshore Sarawak-is a key geological unit for understanding the distribution of hydrocarbon resources in Malaysia. Nevertheless, little effort has been made to address the palaeoenvironmental characteristics of the Tertiary carbonates in the key sector of Central Luconia.We study the sedimentology and petrography of core samples from a well in Central Luconia, for which thirteen microfacies have been identified reflecting different depositional settings. This is the first microfacies scheme elaborated for Luconian carbonates. Lithofacies and microfacies distribution are compatible with deposition in a reef complex, originating around a framework reef, within the euphotic zone. Sediments were deposited in environments of backreef, reef crest, and forereef. The fair weather wave base is marked by the presence of coralline red algae, foraminifera, decreasing degree of bioclast fragmentation and other microfacies features. As a result, a depositional-environmental model is constructed, depicting a reef complex built around a framework reef developed on the margin of an isolated platform. In addition, an innovative, preliminary time series analysis of facies, microfacies and depositional environment data reveal the existence of seasonal cycles in the stacking patterns of facies and microfacies.
基金This project was financially supported by Open Laboratory of Marginal Sea Geology and Paleoenvironment, South China Sea Institute of Oceanology, Chinese Academy of sciences, (No. 6).
文摘On the basis of the sound velocity measurements of the coral reef core from Nanyong No. 1 Well of Yongshu Reef in the Nansha Islands, the paper studies the relations between the vertical sound velocity transition features in the coral reef core and the corresponding stratigraphic depositional facies change as well as stratigraphic gap of erosion, analyses the cause of the sound velocity transition, expounds the concrete process of the sea level change resulting in the stratigraphic gap of erosion and facies change in the coral reef and explains the relations between the vertical sound velocity transition in the coral reef core and the corresponding stratigraphic paleoclimate and the sea level change. This study is of important practical value and theoretical significance to the island and reef engineering construction and the acoustic logging for oil exploration in the reef limestone area as well as the paleoceanographic study of the marginal sea in the western Pacific Ocean.
文摘The bio reef chert suite is an important ore bearing rock assemblage and one of the metallogenic rock suites of superlarge ore deposits. It is formed as a fixed and ordered suite in space and time, and composed of different rocks formed by different geological processes. It is the product of basin evolution at special stage in a special geological setting. It is also the comprehensive product of normal sedimentary process, biological process in basin, hydrothermal sedimentary process under basin base and magmatic process in the deep lithosphere.
基金the Chinese Academy of Sciences(Grant No.XDB26000000)the Natural Science Foundation of Jiangsu Province(Grant No.BK20171102)。
文摘This study focuses on the close association between Devonian reefs and the strata-bound ore deposits in South China.For the first time,the development of Devonian reefs was subdivided into three stages,respectively as the initial,succeeding and peak stages,and its evolution model is proposed.In Dachang,Nandan county,Guangxi Zhuang Autonomous Region(Guangxi for short),a large-scale strata-bound ore deposit formed in a Devonian reef,which was affected by marine volcanic activities and Mesozoic magmatic intrusions.The reef-building reached its peak stage at the Givetian,indicating a large-scale build-up of reef and inter-reef depression.In central-eastern Hunan Province,the strata-bound ore deposits belong to low-temperature ore-types without later magmatic intrusions or volcanic activities.In Hunan Province as well as many other localities in South China,the Givetian reefs played important roles in mobilizing ore-forming materials from the surrounding pre-Devonian rocks,providing spaces and passages for transporting hydrothermal fluid,and progressing mineralization and accumulation of ore-forming materials.
文摘THE reef-chert suite, named by Chen, mainly consists of four types of rocks, with reef carbonate in thelower part, fine detrital rocks in the upper part, chert beds with ore bodies in the intermediate, and synchronous volcanic rocks either in this sequence or in the same sequence in the neighboring district. It isformed as a fixed and ordered suite in space and time, and is the comprehensive product of normal sedimentary process, biological process in extensional basin, hydrothermal sedimentary process near basinbase and magmatic process in the deep of lithosphere in the special geological setting. Many of thesediment-hosted ore deposits usually occur in such a suite in China, such as Dajiangping pyrite deposit,Shuikoushan lead-zinc ore deposit, Changkeng gold-silver deposit, Dachang cassiterite-lead-zinc ore deposit, Xikuangshan stibium ore deposit, Changba-Lijiangou lead-zinc ore deposit, Baiyunebo
