APPROXIMATELY 6,000-7,000years ago China’s primitive so-ciety gradually progressed toits prosperous period.The body shapeof peopel at that time was entirely thesama as modern people.Primitive agriculture started,peop...APPROXIMATELY 6,000-7,000years ago China’s primitive so-ciety gradually progressed toits prosperous period.The body shapeof peopel at that time was entirely thesama as modern people.Primitive agriculture started,people began to raise livestock and live a more sedentary life.Clan villages appeared.However,because of natural disasters and other factors,the primitive people had to constantly change their habitats.Over time,these habitats submerged into ruins,which became bases for archaeologistss in their study of primitive man and his social conditions.展开更多
An ancient wood layer dated at about 5600 cal. a BP by AMS14C dating was discovered in the intertidal zone, East China Sea. Samples affected by ancient woods, including fresh coast bedrock, weathering bedrock, seepage...An ancient wood layer dated at about 5600 cal. a BP by AMS14C dating was discovered in the intertidal zone, East China Sea. Samples affected by ancient woods, including fresh coast bedrock, weathering bedrock, seepage water from coast, seepage water from ancient wood layer, intertidal seawater, fresh water, beach mud, ancient wood barks and ancient peat, were collected for geochemical analysis. The beach mud and the bacteriogenic iron oxides (BIOS) in coastal seepage water were analyzed by min-eralogical and high-resolution transmission electron microscopy (HRTEM)-selected area electron dif-fraction (SAED) analysis. Inorganic sulfur compositions and δ34S of the ancient peat and the beach mud were determined. The results showed that Fe, Mn, S (SO42-) were enriched in the intertidal area at different levels, very likely caused by fermentation of ancient woods. The presence of abundant iron-oxidizing bacteria (FeOB) and sulfate-reducing bacteria (SRB) in this intertidal zone was confirmed by HRTEM-SAED observation, and these bacteria were involved in Fe-S cycle to induce extracellular biomineralization. The negative δ34SV-CDT (-2.9‰) likely indicated the biogenic origin of iron-sulfide minerals in the beach mud at high sulfate reduction rate (SRR). These findings are helpful for under-standing the biogeochemical Fe-S cycle and biomineralization process at high organic matter deposition rate and high SRR in the intertidal zone, estuary, or near shoreline.展开更多
In the study of variation of the earth’s rotation based on the records of some ancientastronomical events, the timing records of ancient astronomical events and phenomena, suchas solar and lunar eclises and lunar occ...In the study of variation of the earth’s rotation based on the records of some ancientastronomical events, the timing records of ancient astronomical events and phenomena, suchas solar and lunar eclises and lunar occultation, are important components of the data.The reliable records, especially those from the countries and regions with advanced an-cient astronomy and timing technology, contain valuable information on the variation展开更多
A 200-year-old greater ancient teahouse called Cuipingju in Shitai County, Anhui Province, was scheduled to be sold to a Swedish businessman for 200,000 yuan, as the owner was financially overburdened for the routine ...A 200-year-old greater ancient teahouse called Cuipingju in Shitai County, Anhui Province, was scheduled to be sold to a Swedish businessman for 200,000 yuan, as the owner was financially overburdened for the routine maintenance of the property. But after intensive media coverage of the deal in early July, the local government immediately identified Cuipingju as a cultural relic and the sale was canceled.展开更多
文摘APPROXIMATELY 6,000-7,000years ago China’s primitive so-ciety gradually progressed toits prosperous period.The body shapeof peopel at that time was entirely thesama as modern people.Primitive agriculture started,people began to raise livestock and live a more sedentary life.Clan villages appeared.However,because of natural disasters and other factors,the primitive people had to constantly change their habitats.Over time,these habitats submerged into ruins,which became bases for archaeologistss in their study of primitive man and his social conditions.
基金Supported by the Project of the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KZCX3-SW-151)
文摘An ancient wood layer dated at about 5600 cal. a BP by AMS14C dating was discovered in the intertidal zone, East China Sea. Samples affected by ancient woods, including fresh coast bedrock, weathering bedrock, seepage water from coast, seepage water from ancient wood layer, intertidal seawater, fresh water, beach mud, ancient wood barks and ancient peat, were collected for geochemical analysis. The beach mud and the bacteriogenic iron oxides (BIOS) in coastal seepage water were analyzed by min-eralogical and high-resolution transmission electron microscopy (HRTEM)-selected area electron dif-fraction (SAED) analysis. Inorganic sulfur compositions and δ34S of the ancient peat and the beach mud were determined. The results showed that Fe, Mn, S (SO42-) were enriched in the intertidal area at different levels, very likely caused by fermentation of ancient woods. The presence of abundant iron-oxidizing bacteria (FeOB) and sulfate-reducing bacteria (SRB) in this intertidal zone was confirmed by HRTEM-SAED observation, and these bacteria were involved in Fe-S cycle to induce extracellular biomineralization. The negative δ34SV-CDT (-2.9‰) likely indicated the biogenic origin of iron-sulfide minerals in the beach mud at high sulfate reduction rate (SRR). These findings are helpful for under-standing the biogeochemical Fe-S cycle and biomineralization process at high organic matter deposition rate and high SRR in the intertidal zone, estuary, or near shoreline.
文摘In the study of variation of the earth’s rotation based on the records of some ancientastronomical events, the timing records of ancient astronomical events and phenomena, suchas solar and lunar eclises and lunar occultation, are important components of the data.The reliable records, especially those from the countries and regions with advanced an-cient astronomy and timing technology, contain valuable information on the variation
文摘A 200-year-old greater ancient teahouse called Cuipingju in Shitai County, Anhui Province, was scheduled to be sold to a Swedish businessman for 200,000 yuan, as the owner was financially overburdened for the routine maintenance of the property. But after intensive media coverage of the deal in early July, the local government immediately identified Cuipingju as a cultural relic and the sale was canceled.
