This study＇s objective was to investigate the Guguan-Xiangong Fault, which lies in the southern Liupanshan area, through satellite image interpretation and field observations. Guguan- Xiangong Fault is divided into f...This study＇s objective was to investigate the Guguan-Xiangong Fault, which lies in the southern Liupanshan area, through satellite image interpretation and field observations. Guguan- Xiangong Fault is divided into five subsegments; among these, the Badu-Longwei segment has been the most recently active. The geomorphic features of the Badu-Longwei segment are clearly displayed, including multiple high fault scarps with fresh bedrock free faces. There is significant evidence for Holocene activity of the three fault sections, located in Renhuashu, Tianjiagou, and Xinjiecun respectively. The three sections feature distinct episodic deposition and fault scratches. Based on 14C- dating and field observations on the three fault sections, two or more paleoearthquakes across the Badu-Longwei fault segment are ascertained, between 5874±116 and 5430±140 a BP, and after 2037±83 a BP respectively. The Badu-Longwei segment of the Guguan-Xiangong Fault is preliminarily extrapolated as the seismogenic structure of the 600 A.D. Qin-Long earthquake.展开更多
The palaeochannels in the studied region are divided into four stages by such methods as 14C dating. Marine (saltwater) transgression in the palaeochannels has been studied as a focal point. Palaeochannels are the mai...The palaeochannels in the studied region are divided into four stages by such methods as 14C dating. Marine (saltwater) transgression in the palaeochannels has been studied as a focal point. Palaeochannels are the main passageway through which the seawater (saltwater) transgresses. The seawater (saltwater) transgresses at a high speed, by many means and in a changeable dynamic state.展开更多
The present report publishes the chronological data of 40 specimens dated by the 14^C Laboratory of Archaeological Science and Techniques Experiment and Research Center, IA, CASS, from November 2001 to October 2002. T...The present report publishes the chronological data of 40 specimens dated by the 14^C Laboratory of Archaeological Science and Techniques Experiment and Research Center, IA, CASS, from November 2001 to October 2002. These specimens come from the following sites: Tianmushan in Jiangyan (1 piece) and Beichuodun in Kunshan (2), Jiangsu; the Huangdi Temple in Jinyun, Zhejiang(1); Guzhendu in Qixia, Shandong (1); Xipo in Lingbao (2), Luohe in Luoyang (4), the Shang City in Yanshi (4) and Yinxu (the Yin Ruins) in Anyang (1), Henan; a Chu tomb inJiangling, Hubei (1); Piyang-Dongga in Ngari Zanda, Xizang (2); Yuntang-Qizhen in Fufeng (9) and Duanjing Village in Binxian County (1), Shanxi; Lajia in Minhe, Qinghai (4); Niya in Minfeng (1), Yingpan in Yuli (4), A'ai in Kuqa (1) and Langan Township in Yutian (1), Xinjiang.展开更多
The structure consideration of a minicyclotron as super- sensitivity mass spectrometer for carbon -14 dating being constructed at this Institute is described. Some new design ideas and techniques are presented.
The origin and quality of groundwater in the Southeastern region （belongs to Southern Plain） were identified by using isotopic techniques and geochemical analysis. Groundwater samples were collected from 7 aquifers...The origin and quality of groundwater in the Southeastern region （belongs to Southern Plain） were identified by using isotopic techniques and geochemical analysis. Groundwater samples were collected from 7 aquifers： the Holocene, upper Pleistocene, middle Pleistocene, lower Pleistocene, upper Pliocene, middle Pliocene and Miocene aquifers. The water isotopic compositions （82H and 8180） were determined to elucidate the origin and the interaction between surface water and groundwater studies. Transit time （age） of the groundwater samples was determined to explain the direction of groundwater flow. The dating techniques included 3H and ^14C isotopes measurement, followed by a correction for the initial ^14C-activity by the ^13C-composition （^13C） in TDIC （Total Dissolved Inorganic Carbon）. Geochemical parameters of the groundwater samples were measured either directly in the field or in the laboratory. The results showed that the groundwater from the Holocene and upper Pleistocene aquifers was most recharged from the local meteorological and hydrological systems, including local precipitation, fiver and reservoirs. Thus, it has short transit time and its stable isotopic composition is spread around the local meteoric waterline and lines for rivers or reservoirs water. The groundwater in the deeper aquifers： middle and lower Pleistocene, and Neogene aquifers has old age up to 22.5 ka BP. Its water seems to be recharged from the areas with an altitude from 600 to 700 m higher to the Neogene deposit layer altitude. The groundwater in the SE SP （South-Eastern Southern Plain） region has a high quality. The water type is Na-Ca-Mg-HCO3 with low content of chloride and TDS （Total Dissolved Solids）. Calcite/dolomite and gypsum dissolution, organic matter decomposition and sequence of red-ox reactions proceeding through different electron acceptors sediment were controlled the chemistry of the groundwater in the study region.展开更多
绰墩遗址第六次发掘的300m^2范围内出土22块古田块，通过对其田埂、灌排系统（水口、水沟、水井）等结构特征的观察研究，对古田块和水沟中出土的灌溉用具——陶罐和陶盆碎片的鉴定是属于马家滨文化时期的器物；从田块表土层中淘洗出大...绰墩遗址第六次发掘的300m^2范围内出土22块古田块，通过对其田埂、灌排系统（水口、水沟、水井）等结构特征的观察研究，对古田块和水沟中出土的灌溉用具——陶罐和陶盆碎片的鉴定是属于马家滨文化时期的器物；从田块表土层中淘洗出大量的炭化稻粒，每克土壤中检测到有上万至十余万颗水稻植硅体，这些结果证明所发现的田块是马家滨时期的灌溉稻田。对出土的炭化稻粒和土壤有机质的14^C定年结果表明其年龄分别为5907 a BP和6280 a BP，是新石器即晚马家滨文化时期的水稻文明。对在遗址挖掘的两个整段剖面（P-01和P．03）的研究发现，P-01剖面上42～103cm层位埋藏有马桥文化-商朝初期（3320aBP）和在103～200cm层位埋藏有马家滨时期（6280aRP）的两个古水稻土剖面，这一结果佐证了前人关于8000年来长江三角洲地区曾有过几次大的洪水泛滥而使人类耕作活动中断的气候变化事件的结论。然而距P-01仅15m的P-03整段剖面上仅出现了马桥-商朝初期的古水稻土剖面（40～100cm），未发现马家滨时期古水稻土剖面（100～200cm），说明当时的生产力非常低下，仅能利用低洼平坦的地方种稻，稍高一点的居住点附近的坡地就无法改成梯田种植水稻了。这两个埋藏的古水稻土剖面均已经发育了水稻土的明显特征。对出土炭化稻粒的形态学研究表明，外型多为椭圆形，长宽比的变异较大，稃面有方格凹陷结构、周边有稃毛，顶端残留有稻芒的基部，基部有护颖而没有小梗，“钝形”的双峰乳突、浅平的凹陷乳沟等均显示其为人工栽培的粳型水稻。结果与丁颖20世纪50年代在黄河流域发现的汉代的炭化稻粒的特征是吻合的，从而支持了关于“我国长江流域与黄河流域古代最早栽培的水稻都是粳稻品种”的论点。展开更多
Core 255 from the southern Okinawa Trough was selected to monitor the shift of the Kuroshio axis over the last 20 000 years. During the last glacial maximum the Kuroshio axis had ever shifted outside the Okinawa Troug...Core 255 from the southern Okinawa Trough was selected to monitor the shift of the Kuroshio axis over the last 20 000 years. During the last glacial maximum the Kuroshio axis had ever shifted outside the Okinawa Trough. It entered the Okinawa Trough again at about 6 500 a BP, leading to abrupt increase of sedimentation rate, distinctly coarser sediment and remarkably increased abundance of foraminiferal indicators of the Kuroshio in the core. But, during about 4 000-3 000 a BP the abundance of the Kuroshio indicator Pulleniatina obliquiloculata sharply decreased again, indicating that the Kuroshio axis had ever shifted easterly for a short period or the Kuroshio was weakened and that moment.展开更多
基金supported by the Chinese Geological Survey (CGS) (Grant No.1212011120181 & Grant No.1212011120115)a key project of the Natural Science Foundation of China (Grant No.41030317)
文摘This study＇s objective was to investigate the Guguan-Xiangong Fault, which lies in the southern Liupanshan area, through satellite image interpretation and field observations. Guguan- Xiangong Fault is divided into five subsegments; among these, the Badu-Longwei segment has been the most recently active. The geomorphic features of the Badu-Longwei segment are clearly displayed, including multiple high fault scarps with fresh bedrock free faces. There is significant evidence for Holocene activity of the three fault sections, located in Renhuashu, Tianjiagou, and Xinjiecun respectively. The three sections feature distinct episodic deposition and fault scratches. Based on 14C- dating and field observations on the three fault sections, two or more paleoearthquakes across the Badu-Longwei fault segment are ascertained, between 5874±116 and 5430±140 a BP, and after 2037±83 a BP respectively. The Badu-Longwei segment of the Guguan-Xiangong Fault is preliminarily extrapolated as the seismogenic structure of the 600 A.D. Qin-Long earthquake.
文摘The palaeochannels in the studied region are divided into four stages by such methods as 14C dating. Marine (saltwater) transgression in the palaeochannels has been studied as a focal point. Palaeochannels are the main passageway through which the seawater (saltwater) transgresses. The seawater (saltwater) transgresses at a high speed, by many means and in a changeable dynamic state.
文摘The present report publishes the chronological data of 40 specimens dated by the 14^C Laboratory of Archaeological Science and Techniques Experiment and Research Center, IA, CASS, from November 2001 to October 2002. These specimens come from the following sites: Tianmushan in Jiangyan (1 piece) and Beichuodun in Kunshan (2), Jiangsu; the Huangdi Temple in Jinyun, Zhejiang(1); Guzhendu in Qixia, Shandong (1); Xipo in Lingbao (2), Luohe in Luoyang (4), the Shang City in Yanshi (4) and Yinxu (the Yin Ruins) in Anyang (1), Henan; a Chu tomb inJiangling, Hubei (1); Piyang-Dongga in Ngari Zanda, Xizang (2); Yuntang-Qizhen in Fufeng (9) and Duanjing Village in Binxian County (1), Shanxi; Lajia in Minhe, Qinghai (4); Niya in Minfeng (1), Yingpan in Yuli (4), A'ai in Kuqa (1) and Langan Township in Yutian (1), Xinjiang.
文摘The structure consideration of a minicyclotron as super- sensitivity mass spectrometer for carbon -14 dating being constructed at this Institute is described. Some new design ideas and techniques are presented.
文摘The origin and quality of groundwater in the Southeastern region （belongs to Southern Plain） were identified by using isotopic techniques and geochemical analysis. Groundwater samples were collected from 7 aquifers： the Holocene, upper Pleistocene, middle Pleistocene, lower Pleistocene, upper Pliocene, middle Pliocene and Miocene aquifers. The water isotopic compositions （82H and 8180） were determined to elucidate the origin and the interaction between surface water and groundwater studies. Transit time （age） of the groundwater samples was determined to explain the direction of groundwater flow. The dating techniques included 3H and ^14C isotopes measurement, followed by a correction for the initial ^14C-activity by the ^13C-composition （^13C） in TDIC （Total Dissolved Inorganic Carbon）. Geochemical parameters of the groundwater samples were measured either directly in the field or in the laboratory. The results showed that the groundwater from the Holocene and upper Pleistocene aquifers was most recharged from the local meteorological and hydrological systems, including local precipitation, fiver and reservoirs. Thus, it has short transit time and its stable isotopic composition is spread around the local meteoric waterline and lines for rivers or reservoirs water. The groundwater in the deeper aquifers： middle and lower Pleistocene, and Neogene aquifers has old age up to 22.5 ka BP. Its water seems to be recharged from the areas with an altitude from 600 to 700 m higher to the Neogene deposit layer altitude. The groundwater in the SE SP （South-Eastern Southern Plain） region has a high quality. The water type is Na-Ca-Mg-HCO3 with low content of chloride and TDS （Total Dissolved Solids）. Calcite/dolomite and gypsum dissolution, organic matter decomposition and sequence of red-ox reactions proceeding through different electron acceptors sediment were controlled the chemistry of the groundwater in the study region.
文摘绰墩遗址第六次发掘的300m^2范围内出土22块古田块，通过对其田埂、灌排系统（水口、水沟、水井）等结构特征的观察研究，对古田块和水沟中出土的灌溉用具——陶罐和陶盆碎片的鉴定是属于马家滨文化时期的器物；从田块表土层中淘洗出大量的炭化稻粒，每克土壤中检测到有上万至十余万颗水稻植硅体，这些结果证明所发现的田块是马家滨时期的灌溉稻田。对出土的炭化稻粒和土壤有机质的14^C定年结果表明其年龄分别为5907 a BP和6280 a BP，是新石器即晚马家滨文化时期的水稻文明。对在遗址挖掘的两个整段剖面（P-01和P．03）的研究发现，P-01剖面上42～103cm层位埋藏有马桥文化-商朝初期（3320aBP）和在103～200cm层位埋藏有马家滨时期（6280aRP）的两个古水稻土剖面，这一结果佐证了前人关于8000年来长江三角洲地区曾有过几次大的洪水泛滥而使人类耕作活动中断的气候变化事件的结论。然而距P-01仅15m的P-03整段剖面上仅出现了马桥-商朝初期的古水稻土剖面（40～100cm），未发现马家滨时期古水稻土剖面（100～200cm），说明当时的生产力非常低下，仅能利用低洼平坦的地方种稻，稍高一点的居住点附近的坡地就无法改成梯田种植水稻了。这两个埋藏的古水稻土剖面均已经发育了水稻土的明显特征。对出土炭化稻粒的形态学研究表明，外型多为椭圆形，长宽比的变异较大，稃面有方格凹陷结构、周边有稃毛，顶端残留有稻芒的基部，基部有护颖而没有小梗，“钝形”的双峰乳突、浅平的凹陷乳沟等均显示其为人工栽培的粳型水稻。结果与丁颖20世纪50年代在黄河流域发现的汉代的炭化稻粒的特征是吻合的，从而支持了关于“我国长江流域与黄河流域古代最早栽培的水稻都是粳稻品种”的论点。
文摘Core 255 from the southern Okinawa Trough was selected to monitor the shift of the Kuroshio axis over the last 20 000 years. During the last glacial maximum the Kuroshio axis had ever shifted outside the Okinawa Trough. It entered the Okinawa Trough again at about 6 500 a BP, leading to abrupt increase of sedimentation rate, distinctly coarser sediment and remarkably increased abundance of foraminiferal indicators of the Kuroshio in the core. But, during about 4 000-3 000 a BP the abundance of the Kuroshio indicator Pulleniatina obliquiloculata sharply decreased again, indicating that the Kuroshio axis had ever shifted easterly for a short period or the Kuroshio was weakened and that moment.
