近年来,作者在横断山脉三江并流区开展历史堵江滑坡调查,在金沙江上游发现系列沿江分布的残碉,其中以左岸的白玉县卓英村残碉分布最为集中,共17座,且未见公开报道。这些残碉是一个历史部落或村庄的遗迹,是藏彝走廊历史文化遗存的组成部...近年来,作者在横断山脉三江并流区开展历史堵江滑坡调查,在金沙江上游发现系列沿江分布的残碉,其中以左岸的白玉县卓英村残碉分布最为集中,共17座,且未见公开报道。这些残碉是一个历史部落或村庄的遗迹,是藏彝走廊历史文化遗存的组成部分。鉴于藏彝走廊研究主要集中在社会科学方面,本文尝试采用自然科学方法拓展相关研究。基于现场调查和地质测年,结合前人工作成果,确定残碉群的建造时间与历史归属,分析历史滑坡堵江事件对河流地貌与河谷文明演变的影响。结果表明:1)卓英村残碉群兴建于1780~1490 a BP,相应的历史年代为东汉末期至南朝时期,按地域极有可能是古白狼国遗迹;2)残碉的修建高程和时间与措拉古滑坡堰塞湖尾部的湖滩高程和溃决时间等具有较好的一致性,湖泊淤积、干热河谷气候、取水便利等为卓英村的兴起奠定了基础;3)约1510 a BP前的一次大洪水事件导致措拉堰塞坝完全溃决,岸坡塌岸引起的耕地逐渐消失,以及取水不便等人居环境恶化是导致卓英村被遗弃的自然因素;4)横断山脉河流历史堵江滑坡引起的河道淤积为民族迁徙提供了良好的通道,也留存了丰富的历史遗迹,类似卓英村残碉的深入研究有望丰富和拓展白狼国与藏彝走廊的研究内容。展开更多
Specimens of Amersinia obtrullata and Beringiaphyllum pseudoantiquum in Paleocene Wuyun flora, Heilongjiang Province, Northeast China, were described and assigned to Cornaceae sensu. Infructescences formally allocated...Specimens of Amersinia obtrullata and Beringiaphyllum pseudoantiquum in Paleocene Wuyun flora, Heilongjiang Province, Northeast China, were described and assigned to Cornaceae sensu. Infructescences formally allocated in Trochodendron sp. were reviewed and assigned to Amersinia obtrullata. Leaves described as Populus carneosa, Celastrophyllum subprotophyllum, Viburnum antiquum, V. asperum, Viburniphyllum finale, Protophyllum wuyunense, P. cf. haydenii, P. ovatifolium, Credneria inordinata were also restudied and assigned to Beringiaphyllum pseudoantiquum.展开更多
Deccan volcanic sequences （DYS） in the central Deccan volcanic province （CDYP） are designated as Sahyadri Group having -500 m thick lava pile associated with multiple sedimentary beds at different strati-graphic l...Deccan volcanic sequences （DYS） in the central Deccan volcanic province （CDYP） are designated as Sahyadri Group having -500 m thick lava pile associated with multiple sedimentary beds at different strati-graphic levels. In the eastern part of CDYP between the latitude 19°55-20°25 ′N and the longitudes 78°15-78° 30′E, palynological investigation of the intertrappean sedimentary beds at five stratigraphic levels was carried out. The study was basically aimed for tracking the floral and environmental changes across the Deccan transi-tion. The resulting finds indicate that the intertrappean sediments at the lowest stratigraphic level between the earliest lava flows are characterized by presence of marker Maastrichtian palynomorphs - Gabonisporis vigour- ouxii, Aquilapollenites bengalensis, Azolla cretacea and Farabeipollis associated with triporate and tricolpate pol-len grains, phytoliths of Oryzeae of Poaceae family and peridinoid dinoflagellate cysts. The increasing volcanism deteriorated the existing flora as evident by absence of pollen-spores and presence of only structured biodegraded organic matter, fungal spores, acritarchs and algal （Botryococcus） remains in the sediments of higher-up in the sequence. For chronostratigraphic constraints on the lava flows magnetic polarity of the flows bracketing the in-tertrappean beds was investigated. The results indicated presence of N-R-N-R magnetic polarity in the basal la-va pile that are interpreted as representing the magnetochron C30N to C28R （ Maastrichtian-Paleogene）. The floral change begins with the onset of volcanism in the chron C30N and floral deterioration is observed in C29N with increasing volcanism and it is only in the chron C28 R （ Danian） that some evidence of recovery of flora is recorded. The current study shows that in eastern part of CDYP the post Cretaceous-Paleogene boundary erup-tions represent the main phase of eruptions that triggered deterioration of the flora.展开更多
An international cooperative study of the Late Cretaceous biota and non-marine strata including the Cretaceous-Paleogene(K--Pg) boundary in Jiayin near the Heilongjiang River,China during 2002-2010,is summarized in th...An international cooperative study of the Late Cretaceous biota and non-marine strata including the Cretaceous-Paleogene(K--Pg) boundary in Jiayin near the Heilongjiang River,China during 2002-2010,is summarized in this paper. The strata includes the Upper Cretaceous Yong'ancun-,Taipinglinchang-,Yuliang-zi-,and Furao formations,and the Paleocence Wuyun Formation consisting of Baoshantou Member and a Coalbearing Member. Seven palynological assemblages from Santonian to Paleocene are recognized,which is used for definition of the K--Pg boundary. Through the palynological analysis of three drilled boreholes (XHY-2005,2006,2008) in Xiaoheyan of western Jiayin,the K--Pg boundary is defined within 20. 00-20. 05 m in the borehole XHY-2006 (as a standard boundary) which is just between the top of Furao Formation (late Maasterichtian) and the base of Baishantou Member (early Danian) . These new research results are supported by paleo- magnetic,geochemical and other analyses,also. On the other hand,the presence of eight taxa of Maasterichtian dinosaurs (mostly hadrosaurids) have been recognized by the authors; and two mega-plant assemblages from the Yong'ancun Fm (Santonian) to Taipinglinchang Fm (Campanian) are confirmed. These research a-chievements indicate that the Upper Cretaceous-Paleocene in Jiayin can be well correlated to the strata in the neighboring Zeya-Bureja basin,Russia. The K--Pg boundary definited in Jiayin is the first well documented non-marine K--Pg boundary in China. Also the related paleoclimate,paleoenvironment and the mass extinctions in this area during the Cretaceous-Paleocene transition are also discussed.展开更多
The authors studied zircon LA-ICP-MS U-Pb dating,the zircon Hf isotope and geochemistry of acidic volcanic rocks in Baiyingaolao Formation of Keyouzhongqi area,Inner Mongolia,and discussed the chronology,source region...The authors studied zircon LA-ICP-MS U-Pb dating,the zircon Hf isotope and geochemistry of acidic volcanic rocks in Baiyingaolao Formation of Keyouzhongqi area,Inner Mongolia,and discussed the chronology,source region and tectonic setting of the volcanic rocks in the studied area. The clear oscillatory zoning of zircons indicates a typical magmatic origin,and the results of dating show that the volcanic rocks of Baiyingaolao Formation were formed in Early Cretaceous( 121. 5 ± 1. 0 Ma). The features of major and trace elements show that the rocks are alkali-rich,poor in calcium and magnesium with enrichment in LILEs like Th,U,K and Gd and depletion in HFSEs,e. g. Nb,Ta,Sr and Ti. The fact implies that they were the products of partial melting of the crust. εHf( t) =( +6.30--+9.06) and TDM2= 600--835 Ma,suggest the magma originated from partial melting of the young crust. Combined with the evolution of regional tectonic structure,the authors conclude that the acidic volcanic rocks of Baiyingaolao Formation may be formed under the extensional environment related to the subduction of Paleo-Pacific Plate.展开更多
Present article is on Russian Far East carnivorous dinosaur paleoecology.Described summary is based on detailed study and comparison of isolated shed teeth morphology.
Considered the question about stratigraphic position of coal-bearing continental deposits of the Amur area,the main attention is paid to the definition of pollen of angiosperms.Khlonova(1960),Zaklinskaya(1963),Bratsev...Considered the question about stratigraphic position of coal-bearing continental deposits of the Amur area,the main attention is paid to the definition of pollen of angiosperms.Khlonova(1960),Zaklinskaya(1963),Bratseva(1969) and other scientists reported a lot about the significance of the pollen.Among the new taxa the special interest represents the first description of Engelhardtia pollen of late Maestrichtian and Paleocene deposits.A new kind of pollen Vacuopollis triplicatus sp.nov.is described.展开更多
文摘近年来,作者在横断山脉三江并流区开展历史堵江滑坡调查,在金沙江上游发现系列沿江分布的残碉,其中以左岸的白玉县卓英村残碉分布最为集中,共17座,且未见公开报道。这些残碉是一个历史部落或村庄的遗迹,是藏彝走廊历史文化遗存的组成部分。鉴于藏彝走廊研究主要集中在社会科学方面,本文尝试采用自然科学方法拓展相关研究。基于现场调查和地质测年,结合前人工作成果,确定残碉群的建造时间与历史归属,分析历史滑坡堵江事件对河流地貌与河谷文明演变的影响。结果表明:1)卓英村残碉群兴建于1780~1490 a BP,相应的历史年代为东汉末期至南朝时期,按地域极有可能是古白狼国遗迹;2)残碉的修建高程和时间与措拉古滑坡堰塞湖尾部的湖滩高程和溃决时间等具有较好的一致性,湖泊淤积、干热河谷气候、取水便利等为卓英村的兴起奠定了基础;3)约1510 a BP前的一次大洪水事件导致措拉堰塞坝完全溃决,岸坡塌岸引起的耕地逐渐消失,以及取水不便等人居环境恶化是导致卓英村被遗弃的自然因素;4)横断山脉河流历史堵江滑坡引起的河道淤积为民族迁徙提供了良好的通道,也留存了丰富的历史遗迹,类似卓英村残碉的深入研究有望丰富和拓展白狼国与藏彝走廊的研究内容。
文摘Specimens of Amersinia obtrullata and Beringiaphyllum pseudoantiquum in Paleocene Wuyun flora, Heilongjiang Province, Northeast China, were described and assigned to Cornaceae sensu. Infructescences formally allocated in Trochodendron sp. were reviewed and assigned to Amersinia obtrullata. Leaves described as Populus carneosa, Celastrophyllum subprotophyllum, Viburnum antiquum, V. asperum, Viburniphyllum finale, Protophyllum wuyunense, P. cf. haydenii, P. ovatifolium, Credneria inordinata were also restudied and assigned to Beringiaphyllum pseudoantiquum.
基金SERB-DST ( no. SR / S4 / ES619 /2012 ) for financial assistance
文摘Deccan volcanic sequences （DYS） in the central Deccan volcanic province （CDYP） are designated as Sahyadri Group having -500 m thick lava pile associated with multiple sedimentary beds at different strati-graphic levels. In the eastern part of CDYP between the latitude 19°55-20°25 ′N and the longitudes 78°15-78° 30′E, palynological investigation of the intertrappean sedimentary beds at five stratigraphic levels was carried out. The study was basically aimed for tracking the floral and environmental changes across the Deccan transi-tion. The resulting finds indicate that the intertrappean sediments at the lowest stratigraphic level between the earliest lava flows are characterized by presence of marker Maastrichtian palynomorphs - Gabonisporis vigour- ouxii, Aquilapollenites bengalensis, Azolla cretacea and Farabeipollis associated with triporate and tricolpate pol-len grains, phytoliths of Oryzeae of Poaceae family and peridinoid dinoflagellate cysts. The increasing volcanism deteriorated the existing flora as evident by absence of pollen-spores and presence of only structured biodegraded organic matter, fungal spores, acritarchs and algal （Botryococcus） remains in the sediments of higher-up in the sequence. For chronostratigraphic constraints on the lava flows magnetic polarity of the flows bracketing the in-tertrappean beds was investigated. The results indicated presence of N-R-N-R magnetic polarity in the basal la-va pile that are interpreted as representing the magnetochron C30N to C28R （ Maastrichtian-Paleogene）. The floral change begins with the onset of volcanism in the chron C30N and floral deterioration is observed in C29N with increasing volcanism and it is only in the chron C28 R （ Danian） that some evidence of recovery of flora is recorded. The current study shows that in eastern part of CDYP the post Cretaceous-Paleogene boundary erup-tions represent the main phase of eruptions that triggered deterioration of the flora.
基金the Projects NSFC 30220130698 40842002Project"111"of China+2 种基金the Project of the Bureau of Land&Resources of Heilongjiang,China for their financial supports to this research workthe financial supports of Russian Projects RFFI No.04-04-49522the President Grantfor State Support of Leading Scientific Scholars in Russian Federation SS-1615 of Russia
文摘An international cooperative study of the Late Cretaceous biota and non-marine strata including the Cretaceous-Paleogene(K--Pg) boundary in Jiayin near the Heilongjiang River,China during 2002-2010,is summarized in this paper. The strata includes the Upper Cretaceous Yong'ancun-,Taipinglinchang-,Yuliang-zi-,and Furao formations,and the Paleocence Wuyun Formation consisting of Baoshantou Member and a Coalbearing Member. Seven palynological assemblages from Santonian to Paleocene are recognized,which is used for definition of the K--Pg boundary. Through the palynological analysis of three drilled boreholes (XHY-2005,2006,2008) in Xiaoheyan of western Jiayin,the K--Pg boundary is defined within 20. 00-20. 05 m in the borehole XHY-2006 (as a standard boundary) which is just between the top of Furao Formation (late Maasterichtian) and the base of Baishantou Member (early Danian) . These new research results are supported by paleo- magnetic,geochemical and other analyses,also. On the other hand,the presence of eight taxa of Maasterichtian dinosaurs (mostly hadrosaurids) have been recognized by the authors; and two mega-plant assemblages from the Yong'ancun Fm (Santonian) to Taipinglinchang Fm (Campanian) are confirmed. These research a-chievements indicate that the Upper Cretaceous-Paleocene in Jiayin can be well correlated to the strata in the neighboring Zeya-Bureja basin,Russia. The K--Pg boundary definited in Jiayin is the first well documented non-marine K--Pg boundary in China. Also the related paleoclimate,paleoenvironment and the mass extinctions in this area during the Cretaceous-Paleocene transition are also discussed.
文摘The authors studied zircon LA-ICP-MS U-Pb dating,the zircon Hf isotope and geochemistry of acidic volcanic rocks in Baiyingaolao Formation of Keyouzhongqi area,Inner Mongolia,and discussed the chronology,source region and tectonic setting of the volcanic rocks in the studied area. The clear oscillatory zoning of zircons indicates a typical magmatic origin,and the results of dating show that the volcanic rocks of Baiyingaolao Formation were formed in Early Cretaceous( 121. 5 ± 1. 0 Ma). The features of major and trace elements show that the rocks are alkali-rich,poor in calcium and magnesium with enrichment in LILEs like Th,U,K and Gd and depletion in HFSEs,e. g. Nb,Ta,Sr and Ti. The fact implies that they were the products of partial melting of the crust. εHf( t) =( +6.30--+9.06) and TDM2= 600--835 Ma,suggest the magma originated from partial melting of the young crust. Combined with the evolution of regional tectonic structure,the authors conclude that the acidic volcanic rocks of Baiyingaolao Formation may be formed under the extensional environment related to the subduction of Paleo-Pacific Plate.
基金supported by the Russian Foundation of Fundamental Research Grants No. 07-05-00168-а and No. 10-05-00151-аsupported by the Key-Lab for Evolution of Past Life and Environment in NE Asia, Ministry of Education, China (Jilin University)
文摘Present article is on Russian Far East carnivorous dinosaur paleoecology.Described summary is based on detailed study and comparison of isolated shed teeth morphology.
基金the Project 30220130698 (NSFC)Project 111 of China for supporting to publish this paper
文摘Considered the question about stratigraphic position of coal-bearing continental deposits of the Amur area,the main attention is paid to the definition of pollen of angiosperms.Khlonova(1960),Zaklinskaya(1963),Bratseva(1969) and other scientists reported a lot about the significance of the pollen.Among the new taxa the special interest represents the first description of Engelhardtia pollen of late Maestrichtian and Paleocene deposits.A new kind of pollen Vacuopollis triplicatus sp.nov.is described.
