Based on the analysis of the characteristics of the fossils (mollusks, Radiolaria, planktonic and benthic Foraminifera and Ostracoda) found in the four loess profiles located respectively at Heishigou and Beizhuang Vi...Based on the analysis of the characteristics of the fossils (mollusks, Radiolaria, planktonic and benthic Foraminifera and Ostracoda) found in the four loess profiles located respectively at Heishigou and Beizhuang Villages on Daheishan Island in the Miaodao Islands in the Bohai Straits, and Daweijia and Yujiawaizi Villages in Jinzhou County, Liaodong Peninsula, the distribution and abundance variation of the fossils in vertical profiles are studied, the source of coastal loess is probed and the relationship between loess deposition and paleoclimatic environment as well as sea-level changes is discussed.展开更多
The section Of Yujiawaizi Loess in Dalian, one of the typical sections of China's coastal loess, revealedthree reliable polarity reversal events, i. e., Mungo Event (27. 5～23. 7 ka BP), Laschamp Event (43. 5 ～ ...The section Of Yujiawaizi Loess in Dalian, one of the typical sections of China's coastal loess, revealedthree reliable polarity reversal events, i. e., Mungo Event (27. 5～23. 7 ka BP), Laschamp Event (43. 5 ～ 37. 3 haBP) and Blake Event (125. 4～ 110. 5 ka BP); while reliability of the fourth one, Gothenburg Event, remains to be confirmed. Based on TL datings, polarity events and magnetic susceptibility, the authors have tentatively established the time series of coastal loess accumulation since 140 000 a BP, and estimated the accumulation rate of L1. Meanwhile, the high-righ-resolution magnetic susceptibility curve since 140 000 a BP can be correlated with that of the inland loess in northwest China and 3 180 curves of polar ice core and deep sea cores, but there are still some differences, representing the particular characteristics of coastal environmental evolution. At last, integrating the polarity strata, magnetic susceptibility and other relative data, the authors. have probed into the paleoenvironmental changes since 140 ka BP and climate oscillation cycle of different scale, polarity events and glacial-postglacial climate transition, differencesin climate and environment between the early and late stages of last glacial Period, and the continuance of coastal loessaccumulation.展开更多
This Paper discusses the origin of the Coastal Zone Loess on the Liaodong Peninsula, Liaoning Province.The loess is composed mainly of proximal materials transported by low-altitude air flow and less commonly ofinland...This Paper discusses the origin of the Coastal Zone Loess on the Liaodong Peninsula, Liaoning Province.The loess is composed mainly of proximal materials transported by low-altitude air flow and less commonly ofinland distal materials carried by high-altitude air flow. The main provenance is the Liaodong Bay. When thesea level declined during glacial period, the bottoms of the Liaodong Bay and Bohai Sea emerged, wheredesertization occurred. As a result, submarine sediments were transported by strong northwesterly winds to theeastern coastal zone of the peninsula and deposited there. These materials mixed with the windblown dust car-ried by atmospheric circulation from the interior of the continent, forming the loess.展开更多
文摘Based on the analysis of the characteristics of the fossils (mollusks, Radiolaria, planktonic and benthic Foraminifera and Ostracoda) found in the four loess profiles located respectively at Heishigou and Beizhuang Villages on Daheishan Island in the Miaodao Islands in the Bohai Straits, and Daweijia and Yujiawaizi Villages in Jinzhou County, Liaodong Peninsula, the distribution and abundance variation of the fossils in vertical profiles are studied, the source of coastal loess is probed and the relationship between loess deposition and paleoclimatic environment as well as sea-level changes is discussed.
文摘The section Of Yujiawaizi Loess in Dalian, one of the typical sections of China's coastal loess, revealedthree reliable polarity reversal events, i. e., Mungo Event (27. 5～23. 7 ka BP), Laschamp Event (43. 5 ～ 37. 3 haBP) and Blake Event (125. 4～ 110. 5 ka BP); while reliability of the fourth one, Gothenburg Event, remains to be confirmed. Based on TL datings, polarity events and magnetic susceptibility, the authors have tentatively established the time series of coastal loess accumulation since 140 000 a BP, and estimated the accumulation rate of L1. Meanwhile, the high-righ-resolution magnetic susceptibility curve since 140 000 a BP can be correlated with that of the inland loess in northwest China and 3 180 curves of polar ice core and deep sea cores, but there are still some differences, representing the particular characteristics of coastal environmental evolution. At last, integrating the polarity strata, magnetic susceptibility and other relative data, the authors. have probed into the paleoenvironmental changes since 140 ka BP and climate oscillation cycle of different scale, polarity events and glacial-postglacial climate transition, differencesin climate and environment between the early and late stages of last glacial Period, and the continuance of coastal loessaccumulation.
文摘This Paper discusses the origin of the Coastal Zone Loess on the Liaodong Peninsula, Liaoning Province.The loess is composed mainly of proximal materials transported by low-altitude air flow and less commonly ofinland distal materials carried by high-altitude air flow. The main provenance is the Liaodong Bay. When thesea level declined during glacial period, the bottoms of the Liaodong Bay and Bohai Sea emerged, wheredesertization occurred. As a result, submarine sediments were transported by strong northwesterly winds to theeastern coastal zone of the peninsula and deposited there. These materials mixed with the windblown dust car-ried by atmospheric circulation from the interior of the continent, forming the loess.
