Journal of Southeast Asian earth sciences最新文献

{"title":"On the Banxi Group and its related tectonic problems in south China","authors":"Liu Hongyun,&nbsp;Liu Yuejun,&nbsp;Hao Jie","doi":"10.1016/0743-9547(96)00025-6","DOIUrl":"https://doi.org/10.1016/0743-9547(96)00025-6","url":null,"abstract":"<div><p>In south China, the Banxi Group is a stratigraphic unit. It has attracted wide attention since Hsu (1980, 1987) and Hsu <em>et al.</em> (1987, 1988) interpreted it as a Banxi Melange in their tectonic model of ‘Huanan Alps’ in the 1980s. Our geological studies lead us to believe that it is reasonable to redefine the Banxi Group as a lithostratigraphic unit composed of the Madiyi and Wuqiangxi Formations in the Xuefeng-Wuling mountain area. The Banxi Group in Hsu's Banxi Melange refers to the larger ‘Banxi Group’ as adopted in the 1960s and 1970s. The stratigraphic, tectonic, isotopic and paleontologic data clearly indicate that: (1) the Banxi Group has a normal sedimentary sequence; (2) the lower subgroup of the former larger ‘Banxi Group’ is a set of metamorphic rocks with ophiolite blocks and was formed before Sinian and not in the Mesozoic collision orogeny in south China (‘Huanan Alps’); (3) there is no structural window or klippe that can be taken as evidence for a ‘Huanan Alps’ as in Hsu's concept of a Banxi Melange. As a result, Hsu's concept is untenable, and there is no ‘Huanan Alps’ or Mesozoic collision orogeny between the Yangtze and Huanan blocks.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Pages 191-196"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)00025-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72115798","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}

{"title":"Three global-scale seismotectonic systems and the geoid","authors":"Ma Zongjin,&nbsp;Gao Xianglin","doi":"10.1016/0743-9547(96)00040-2","DOIUrl":"https://doi.org/10.1016/0743-9547(96)00040-2","url":null,"abstract":"<div><p>Based on the comprehensive studies of the global seismicity and active tectonics, the global seismotectonics is summarized in three great systems: (1) the circum-Pacific seismotectonic system of deep subduction (system P); (2) the Atlantic seismotectonic system of mid-oceanic ridge rift (system A); and (3) the continental seismotectonic system of shear nets (system C). There is a high dynamic correlation between the distribution of these three systems on the Earth's surface and the deflection of the geoid relative to the ideal rotating ellipsoid. Comparative analyses of the three systems are made by using the data of tectonic deformation and earthquake mechanism. System A is characterized by planar extensional fractures. System P demonstrates obduction and overthrusting of the Atlantic (0°) hemisphere lithosphere towards the Pacific (180°) hemisphere lithosphere. System A represents dilatation of the south hemisphere, while system C indicates contraction of the north hemisphere. The dynamic connection between the circum-Antarctic oceanic ridge and system C is probably associated with the longitudinal flow of the mantle.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Pages 337-340"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)00040-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72110450","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}

{"title":"Postscript","authors":"","doi":"10.1016/0743-9547(96)83686-5","DOIUrl":"https://doi.org/10.1016/0743-9547(96)83686-5","url":null,"abstract":"","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Page 379"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)83686-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72115796","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}

{"title":"Geomorphological evolution of the Merbok estuary area and its impact on the early state of Kedah, northwest peninsular Malaysia","authors":"T.T. Khoo","doi":"10.1016/0743-9547(96)00042-6","DOIUrl":"https://doi.org/10.1016/0743-9547(96)00042-6","url":null,"abstract":"<div><p>The Merbok estuary area was formerly a bay with an elongate bay mouth bar. Regression of sea level during the Late Holocene had caused the disappearance of the bay. Evidence from seismic studies show that the Merbok River was not a river till more recent times. Soil survey and field mapping delineated the former beach inland. An emergent shoreline development model is proposed for the geomorphological development. Historical records and archaeological evidence indicate that the present shoreline configuration was almost in place by about 1400. The regression of the sea level had caused the decrease in importance of early Kedah which was sited in the estuary area. In addition several other problems are also explained or resolved by the emergent shoreline model such as the early geography in relation to early Kedah and identification of Kedah in early records from improved knowledge of the palaeogeography. Considering several lines of evidence from field data to historical and archaeological evidence, it is interpreted that the fall in sea level from 2–3 m to the present level was relatively rapid (200 years or less) compared with periods of still-stand. The reconstruction of the palaeo-shoreline also helps to clarify geographical features described in the ancient <em>Kedah Annals</em>, which appear to contain eye-witness accounts of regression of the sea level and not fairy tales as believed by several eminent commentators.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Pages 347-371"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)00042-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72115799","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}

{"title":"A brief review of the Permian macrofloras in southeast Asia and their phytogeographical delimitation","authors":"Li Xingxue ,&nbsp;Shen Guanglong","doi":"10.1016/0743-9547(96)00022-0","DOIUrl":"https://doi.org/10.1016/0743-9547(96)00022-0","url":null,"abstract":"<div><p>A brief annotated introduction to the Permian macrofloras of southeast Asia is given. This is followed by discussion on the identification of some genera and/or species with corrections. Based on this, a sketch map showing the Permian phytogeographical delimitation of southeast Asia is proposed. The composition and geological age of the principal Permian floras is shown in the form of a table.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Pages 161-170"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)00022-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72115797","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}

{"title":"Correlation of Pre-Jurassic sections of ancient continents and microcontinents in East Asia","authors":"I.V. Gordienko","doi":"10.1016/0743-9547(96)00028-1","DOIUrl":"https://doi.org/10.1016/0743-9547(96)00028-1","url":null,"abstract":"<div><p>Between the Siberian and north China platforms, within the Mongol-Okhotsk fold belt there are a series of ancient massifs (microcontinents), whose origin is not yet known. Combined with available data, the author's studies support the conclusion that the Siberian and north China continents, as well as the Tuvin-Mongolian and central Mongolian microcontinents constituted a unified supercontinent in Early Riphean. The formation of the Paleoasian and Mongol-Okhotsk oceans resulted in its disintegration in Late Riphean. Other Precambrian massifs of this region such as Near Argun, Jiamusi-Bureya, South Gobi and Xingkai are allochthonous terranes of an unknown origin and age. The structures of their basement and sedimentary cover are not similar to those of the Siberian and north China platforms.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Pages 215-221"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)00028-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72109798","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}

{"title":"Some characteristics of the orogenic belts in Qinghai-Tibet plateau","authors":"Chen Bingwei,&nbsp;Wang Yanbin","doi":"10.1016/0743-9547(96)83685-3","DOIUrl":"https://doi.org/10.1016/0743-9547(96)83685-3","url":null,"abstract":"<div><p>The Qinghai-Tibet plateau can be divided into a northern and a southern part, with the Kunlun central thrust forming the boundary. The nothern orogenic belts developed on the rigid basement, starting with rifting and geosynclines in the preorogenic stage, followed by collision to form mountains, and postorogenic deformation, mainly producing overthrusting and overlapping structures. The southern counterparts developed on a flexible basement, characterized by strong activity, and polycyclic opening and closing, with well defined oceanic basins and widespread terrigenous deposits on both flanks in the preorogenic stage, and complicated deformation in the postorogenic stage with a large number of strike-slip faults besides overthrusting and overlapping structures. The overall tectonic framework is a series of unique orogenic belts in the Qinghai-Tibet plateau. There are numerous orogenic belts developed in the Qinghai-Tibet plateau, such as the Himalayas, Gangdise, Tanggula, Hoh Xil, Kunlun and Qilian mountains. These belts provide valuable information on the evolution of the lithosphere. Therefore, it is important to summarize the main characteristics of the orogenic belts.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Pages 237-242"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)83685-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72110451","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}

{"title":"‘Suture zones’ in peninsular Malaysia and Thailand: implications for palaeotectonic reconstruction of southeast Asia","authors":"B.K. Tan","doi":"10.1016/0743-9547(96)00031-1","DOIUrl":"https://doi.org/10.1016/0743-9547(96)00031-1","url":null,"abstract":"<div><p>The existence of one or more long suture zones extending from Thailand to peninsular Malaysia has been widely accepted in almost all palaeotectonic reconstruction of southeast Asia. Geological evidence from the areas where suture zones have been proposed in these two countries are not reconcilable with many of the inferences and interpretations of the geology on which the palaeotectonic models are based. With the possible exception of the Nan-Uttaradit suture in Thailand, the relationship of the other proposed ‘suture’ to subduction processses must be regarded as highly doubtful. Correlating geological belts from north Thailand to southern peninsular Malaysia is extremely difficult, given the present limited state of our knowledge of the geology in these two geologically complex regions. Correlation, based on simple classification of granites and their implied geotectonic setting can be misleading. The timing of the proposed collision event to bring together the Gondwana terrain with the Asian terrain, as envisaged in the popular reconstruction scheme, remains one of the most crucial problem which needs to be addressed by those advocating this concept. Palaeontological, stratigraphical, igneous, metamorphic and structural evidence, which can shed light on this difficult question, give conflicting ages for the major orogenic events in this region.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Pages 243-249"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)00031-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72115800","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}

{"title":"Collisional orogene between north and south China and its eastern extension in the Korean Peninsula","authors":"Edmund Z. Chang","doi":"10.1016/0743-9547(96)00033-5","DOIUrl":"https://doi.org/10.1016/0743-9547(96)00033-5","url":null,"abstract":"<div><p>The relative movement between the north China block (Sino-Korean craton) and the south China block (Yangtze-Cathaysian craton) had been right-lateral along a transform fault during the Late Paleozoic. Devonian deep-water deposits on oceanic crust existed only in the east Qinling and Tongbuo areas where subduction of ocean crust is evidenced by metamorphism, magmatism and deformation. Carboniferous and Permian clastics and minor carbonates of shallow marine and terrestrial facies were deposited in a series of narrow basins with general east-west trending, and were controlled by the transform fault. The biota of the basins were communicated with the contemporary sedimentary basins in south China, north China and west China. There has been no wide Mesozoic oceanic crust between the north and south China blocks. Tectonic framework of central China during the Late Paleozoic is quite similar to that of western North America during the Cenozoic.</p><p>Amalgamation of Sino-Korean craton with Siberian craton at the end of Paleozoic changed the moving direction of the former to the southeast and contraction was prevailing between the already juxtaposed north and south China blocks and the intervening Dabie-Su-Lu microcontinent. The southeast corner of north China block was slipped into the concave of the microcontinent, and enabled the latter to be underthrusted to a depth of more than 80 km to form a ultra-high pressure metamorphic complex in Early and Middle Triassic time. Down-going oceanic crust is not a prerequisite of A-type subduction such as the case in Pamir. The Tan-Lu fault, primarily a hinge fault, took place at the climax of contraction between north and south China blocks in the Late Triassic. Differential uplifting and the consequent erosion of Dobie and Su-Lu terranes, which are constituted by piles of subhorizontal thrust sheets, led to an apparent left-lateral offset. Su-Lu was uplifted higher and unroofed deeper than Dabie. An ancient river system along the east-west trending suture had been drained off into Songpan-Ganzi ocean to the west. Collision of the Indian plate with the Eurasian plate shifted the relative movement between the north and south China blocks to the left-lateral and initiated the Fen-Wei graben since Paleogene.</p><p>The Imjingang belt between North and South Korea connects to the suture zone in the Dabie-Su-Lu area. To the east, an active continental margin along the southern margin of the Hida belt of Japanese islands prevailed in the Late Paleozoic. The Ogcheon belt in South Korea is an Early Paleozoic rift zone which is the extension of the Huanan aulacogen in south China. The Gyeonggi and Ryeongnam massifs of South Korea recorrelated to Yangtze and Cathaysian massifs in the mainland of China.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Pages 267-277"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)00033-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72109792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tectonic evolution and oil and gas of Tarim basin","authors":"Kang Yuzhu ,&nbsp;Kang Zhihong","doi":"10.1016/0743-9547(96)00038-4","DOIUrl":"https://doi.org/10.1016/0743-9547(96)00038-4","url":null,"abstract":"<div><p>According to the new results achieved in the past ten years and more, using mobilism and the theory of polycycle by Huang Jiqing (1977, 1984), the formation of the basement of the Tarim basin and its characteristics are summarized. The prototype basins formed since Sinian times are classified into rift basin, continental marginal basin, cratonic basin, foreland basin and others. The Tarim basin is regarded as a huge oil- and gas-bearing basin superposed by prototype basins of different ages. The tectonic characteristics of these basins including tectonic movements, tectonic migrations, faults and trap types are summarized. In addition, structural control over oil and gas and oil-forming features are analysed.</p></div>","PeriodicalId":85022,"journal":{"name":"Journal of Southeast Asian earth sciences","volume":"13 3","pages":"Pages 317-325"},"PeriodicalIF":0.0,"publicationDate":"1996-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0743-9547(96)00038-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72109791","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}