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CALIBRATION OF MG/CA THERMOMETRY OF THE BENTHIC FORAMINIFERA FROM THE BERING SEA: CALIBRATION OF MG/CA THERMOMETRY OF THE BENTHIC FORAMINIFERA FROM THE BERING SEA 白令海底栖有孔虫mg / ca测温的校正:白令海底栖有孔虫mg / ca测温的校正
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04165
L. Ye, Z. Qiu, J. Lei
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引用次数: 0
EVOLUTION OF EARLY PLEISTOCENE DEEP WATER CIRCULATION IN WESTERN PACIFIC: EVIDENCE FROM BENTHIC FORAMINIFERA: EVOLUTION OF EARLY PLEISTOCENE DEEP WATER CIRCULATION IN WESTERN PACIFIC: EVIDENCE FROM BENTHIC FORAMINIFERA 西太平洋早更新世深水环流的演化:来自底栖有孔虫的证据
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04097
Mengsha Chen, Baoqi Huang
Benthic foraminifera picked out from the interval of 43.02~26.27 mbsf(meters below seafloor) of ODP 807(3°36.42′N,156°37.49′E,water depth 2 803.8 m,length 822.9 m)on the Ontong-Java Plateau,western Pacific was studied for understanding the changes in paleoproductivity and its relation with deep water circulation during the period of 2.5~1.6 MaBP.The benthic foraminifera accumulation rate(BFAR),Epifaunal/Infaunal ratio(E/I),percentage of Uvigerina spp.and total organic carbon(TOC%) were used as the proxies of paleoproductivity in this study.Results show that the change in paleoproductivity was generaly high in glacials but low in interglacials during the period of 2.5~1.6 MaBP.,except Bulimina alazanensis,of which the paleopruductivity was low in glacials but high in interglacials.It may suggest that B.alazanensis,opposite to the others,preferred a warmer environment with lower nutrients.The benthic foraminiferal fauna was dominated by Uvigerina spp.in the samples,indicating that the western Pacific deep water was under the control of the North Pacific Deep Water Mass during Early Pleistocene.
本文研究了西太平洋onong -爪哇高原ODP 807(3°36.42'N,156°37.49'E,水深2 803.8 m,长822.9 m)在43.02~26.27 mbsf(海底以下米)范围内的底栖有孔虫,以了解2.5~1.6 MaBP时期古生产力的变化及其与深水环流的关系。本研究以底栖有孔虫积累速率(BFAR)、底面/底面比值(E/I)、蛭形藻百分比和总有机碳(TOC%)作为古生产力的指标。结果表明,在2.5~1.6 MaBP期间,古生产力变化总体上表现为冰期变化大,间冰期变化小。除alazanensis外,其古生产力在冰期较低,在间冰期较高。这可能表明b.a alazanensis与其他物种相反,更喜欢温暖的低营养环境。样品底栖有孔虫区系以Uvigerina spp.为主,表明西太平洋深水早更新世受北太平洋深水块控制。
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引用次数: 0
HIGH RESOLUTION QUATERNARY SEISMIC SEQUENCE STRATIGRAPHY AND PALEOENVIRONMENTAL EVOLUTION IN THE NORTHERN SOUTH CHINA SEA: HIGH RESOLUTION QUATERNARY SEISMIC SEQUENCE STRATIGRAPHY AND PALEOENVIRONMENTAL EVOLUTION IN THE NORTHERN SOUTH CHINA SEA 南海北部高分辨率第四纪地震层序地层学与古环境演化:南海北部高分辨率第四纪地震层序地层学与古环境演化
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04049
Huangmin Ge, Qianyu Li, G. Zhong, Xuejie Li
Based on the high-quality seismic profiles acquired from the northern South China Sea(SCS),we performed a detailed seismic sequence stratigraphic study.Correlation of the results with core samples and logging data from ODP Leg 184 and other deep sea records have been carried out to detect the difference and connection between geological and geophysical research methods,so as to reconstruct the sedimentary history of this area.About 14 seismic horizons are recognized by thin-bed tracking and seismic terminations analysis(including onlap,downlap,toplap,and truncation),including six continuous boundaries,three discontinuous boundaries,and five local boundaries.Then six seismic sequences are established.Detailed analyses of their reflecting characters,top and bottom ages,thickness and sedimentary rate helped build a Quaternary seismic stratigraphic framework at a resolution of ~10 ka.Consistency between seismic profiles and drilling data of ODP Sites 1144 and 1146 indicates that high resolution seismic analyses can produce a direct,detailed and reliable stratigraphic division scheme better than the traditional petrographic description sometimes.The correlation of seismic sequence framework with deep sea sediment records suggests that most of the reflector boundaries correspond to glacial periods or colder intervals of interglacial periods.6 continuous boundaries corresponding to large glacials in the Quaternary were identified.Besides,the seismic sequence results are correlated well with the climate change revealed by different proxies in marine sediment such as oxygen isotopes,carbon dust deposition,and water-layer structure.The most typical is SB 6 equivalent to the Middle Pleistocene Transition,a remarkable global climate event found in marine sediment,ice core,loess and geomagnetic records.Our results prove that integrated geological and geophysical researches can bring up a better understanding to the sedimentological evolution history of the studied area.
基于南海北部高质量地震剖面,进行了详细的地震层序地层学研究。将结果与岩心样品和ODP Leg 184等深海记录的测井资料进行对比,发现地质和地球物理研究方法的差异和联系,从而重建该地区的沉积历史。通过薄层跟踪和地震终止分析(包括上覆、下覆、上覆和截断),共识别出14个地震层,包括6个连续边界、3个不连续边界和5个局部边界。建立了6个地震序列。详细分析了它们的反射特征、顶底年龄、厚度和沉积速率,建立了~10 ka分辨率的第四纪地震地层格架。1144和1146两个ODP点地震剖面与钻井资料的一致性表明,高分辨率地震分析有时比传统的岩相描述更能给出直接、详细、可靠的地层划分方案。地震层序格架与深海沉积记录的对比表明,大部分反射面边界对应于冰期或间冰期的较冷段。确定了与第四纪大冰川相对应的6条连续界线。此外,地震序列结果与海洋沉积物中氧同位素、碳尘沉积、水层结构等指标反映的气候变化具有较好的相关性。最典型的是相当于中更新世过渡期的sb6,这是一个显著的全球气候事件,在海洋沉积物、冰芯、黄土和地磁记录中都有发现。结果表明,地质与地球物理相结合的研究有助于更好地了解研究区沉积演化史。
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引用次数: 2
FLUCTUATIONS OF CARBONATE CONTENT AND ITS CONTROL FACTORS IN THE WESTERN PHILIPPINE SEA FOR THE LAST 150KA: FLUCTUATIONS OF CARBONATE CONTENT AND ITS CONTROL FACTORS IN THE WESTERN PHILIPPINE SEA FOR THE LAST 150KA 西菲律宾海近150ka碳酸盐含量波动及其控制因素:西菲律宾海近150ka碳酸盐含量波动及其控制因素
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04149
Hanjie Sun, Tiegang Li, Rongtao Sun, Zhaokai Xu, F. Chang
The carbonate content of bulk samples was analyzed for the sediment cores of MD06-3050 taken from Benham Rise,western Philippine Sea.The fluctuations in carbonate content for the past 150 ka show a general pattern of the "Atlantic type" of carbonate cycle,i.e.lower in glacials and higher in interglacials.Both sediment coarse fractions and foraminifera fragment ratios were used as indicators of the dissolution intensity of carbonate,and show a similar pattern to carbonate content change since 150 ka.TOC content in bulk samples was also measured,which showed a good consistency with carbonate content.In contrast,the primary productivities derived from the relative abundance of coccolith species F.profunda,yield significantly different trend.By comparison of above proxies,it is inferred that there may be multiple factors controlling the variation in carbonate content,but dissolution is certainly the most important.This dissolution pattern maybe related to the Corg/CaCO3 rain ratio and the ventilation of deep water.
对菲律宾海西部Benham隆起MD06-3050沉积物岩心进行了整体样品碳酸盐含量分析。过去150 ka碳酸盐含量的波动表现出“大西洋型”碳酸盐旋回的一般模式,即:冰期较低,间冰期较高。以沉积物粗组分和有孔虫碎屑比作为碳酸盐溶蚀强度的指标,与150 ka以来碳酸盐含量的变化规律相似。同时测定了样品中TOC含量,结果表明TOC含量与碳酸盐含量具有良好的一致性。与此相反,由深谷种相对丰度推算出的初级生产力,产量有显著差异趋势。通过对上述指标的比较,推断碳酸盐含量的变化可能受多种因素的控制,但溶蚀作用无疑是最重要的。这种溶解模式可能与co2 /CaCO3降雨比和深水通风有关。
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引用次数: 0
TURBIDITE DEPOSITION RECORD AND ITS MECHANISM SINCE 150 KABP IN WESTERN PHILIPPINE SEA: TURBIDITE DEPOSITION RECORD AND ITS MECHANISM SINCE 150 KABP IN WESTERN PHILIPPINE SEA 菲律宾海西部150kabp以来浊积岩沉积记录及其机制:菲律宾海西部150kabp以来浊积岩沉积记录及其机制
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04157
Xiaohua Qiu, Tiegang Li, F. Chang, Zhaokai Xu, Haiming Gong, Zai-Chun Yang
Core MD06-3052 was taken from the continental slope off the Luzon Island in the western Philippine Sea.Multiple proxies such as AMS14C dating,sediment grain size and foraminiferal oxygen isotope were used to reveal the 5 turbidite events since 150 kaBP.The turbidites have coarser grain size than the normal layers,mostly composing of sand and silt.The occurrence time of the 5 turbidite events was calculated by AMS14C dating and oxygen isotope as 13.3,20.4,34.3,41.7 and 121.8 kaBP,separately,of which the latter 4 ones occurred in the low sealevel stages of the last glacial,especially in MIS 2-3,and the earliest one at the relatively low sealevel stage in MIS 5e,indicating that rapid sealevel oscillation during low sealevel stages was probably the main cause of the turbidite events.However,the steep slope may be a favorable topography for the sediment instabilities in Core MD06-3052.
MD06-3052岩心取自菲律宾海西部吕宋岛陆坡。利用AMS14C定年、沉积物粒度、有孔虫氧同位素等多指标揭示了150 kaBP以来的5次浊积岩事件。浊积岩的粒度比正常层粗,主要由砂和粉砂组成。经AMS14C测年和氧同位素计算,这5次浊积岩事件的发生时间分别为13.3、20.4、34.3、41.7和121.8 kaBP,其中后4次浊积岩事件发生在末次冰期低海平面阶段,特别是在MIS 2-3,最早的浊积岩事件发生在MIS 5e相对低海平面阶段,表明低海平面阶段的快速海平面振荡可能是浊积岩事件发生的主要原因。然而,陡坡可能是MD06-3052岩心沉积物失稳的有利地形。
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引用次数: 3
PROVENANCE OF SEDIMENTS IN THE NORTHERN OKINAWA TROUGH OVER THE LAST 24 KA: HIGH RESOLUTION RECORD FROM MAJOR ELEMENTS: PROVENANCE OF SEDIMENTS IN THE NORTHERN OKINAWA TROUGH OVER THE LAST 24 KA: HIGH RESOLUTION RECORD FROM MAJOR ELEMENTS 冲绳海槽北部近24 ka沉积物物源:主要元素的高分辨率记录;冲绳海槽北部近24 ka沉积物物源:主要元素的高分辨率记录
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04073
Zhaokai Xu, F. Chang, Tiegang Li, Qingyun Nan, F. Jiang, Li Anchun
Major elements were studied for reconstruction of sediment provenance and paleoenvironment over the last 24 kaBP with the samples collected from Core PC-1 in the northern Okinawa Trough.In addition to major elements,grain size of 402 samples and planktonic foraminifer δ18O of 344 samples have been analyzed that leads to an average resolution at centennial scale.The study offers a new high resolution material for reconstructing the history and main control factors of the sediment input in the northern Okinawa Trough over the last 24 ka.In according to the variation in major element compositions,the core could be divided into three distinct depositional units,separated by two volcanic layers at 7.3 and 12.7 cal kaBP respectively.Both provenance discriminating plot and R-mode factor analysis indicate that vertical changes in major elements are mainly contributed by the nearby terrestrial materials,whereas the contribution from hydrothermal activity,marine biologic deposition,and volcanism are minor.In particular,the contribution of nearby terrestrial materials show an obvious change trend and can be well correlated with the sea level fluctuation and the evolution of the Tsushima Warm Current.It seems that paleoclimate renders no significant impact on the change in terrigenous sediment provenance.
利用冲绳海槽北部PC-1岩心样品,研究了近24 kaBP沉积物源和古环境的主要元素重建。除主要元素外,对402个样品的粒度和344个样品的浮游有孔虫δ18O进行了分析,得到了百年尺度的平均分辨率。该研究为重建冲绳海槽北部近24 ka沉积物输入的历史和主控因素提供了新的高分辨率资料。根据主要元素组成的变化,可将岩心划分为3个不同的沉积单元,分别被7.3和12.7 cal kaBP的两个火山层隔开。物源判别图和r型因子分析均表明,主要元素的垂直变化主要受附近陆源物质的影响,而热液活动、海洋生物沉积和火山作用的影响较小。特别是附近陆源物质的贡献呈现出明显的变化趋势,与海平面波动和对马暖流的演变具有较好的相关性。古气候对陆源沉积物物源的变化影响不大。
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引用次数: 3
RADIOLARIANS IN UPPER WATERS OF NANSHA SEA AREA BEFORE AND AFTER THE SUMMER MONSOON ONSET: RADIOLARIANS IN UPPER WATERS OF NANSHA SEA AREA BEFORE AND AFTER THE SUMMER MONSOON ONSET 夏季风爆发前后南沙海区上层水域放射虫群:夏季风爆发前后南沙海区上层水域放射虫群
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04025
Lanlan Zhang, Muhong Chen, Rong Xiang, S. Du
28 towing samples for plankton were collected from the upper waters of the Nansha Islands and its adjacent sea areas in the spring of 2002 and 2004 for understanding the distribution pattern of modern radiolarians and their annual changes in the upper waters of Nansha sea area before and after the summer monsoon onset.The results showed that the dominant species in the spring of 2002 and 2004 were consisting of the tropical-subtropical warm species;however there were obviously annual differences in abundance distributions of radiolarians and their typical species.Noticeably,the radiolarian abundance and its dominant species were significantly different before and after the summer monsoon onset,suggesting that there was a response of radiolarians in upper waters to summer monsoon onset in the South China Sea;The radiolarian abundance after the summer monsoon onset was significantly higher than that before the summer monsoon onset,indicating that the marine environment after the summer monsoon onset would be good for the survive of radiolarians.However,it is necessary to further study the mechanism of the change and try to find more direct environmental parameters to indicate the changes in distribution pattern before and after the summer monsoon onset.This study also confirmed that T.octacantha and S.glacialis could be proxies for upwelling processes in the tropic.
2002年和2004年春季在南沙群岛及邻近海域采集了28份浮游生物拖曳样,了解了南沙海域夏季风爆发前后现代放射虫的分布格局及其年变化。结果表明:2002年和2004年春季优势种为热带-亚热带暖暖型种,但放射虫及其典型种的丰度分布存在明显的年际差异;值得注意的是,夏季风爆发前后放射虫丰度及其优势种存在显著差异,表明南海上层水域放射虫对夏季风爆发有响应;夏季风爆发后放射虫丰度显著高于夏季风爆发前,表明夏季风爆发后的海洋环境有利于放射虫的生存。但是,有必要进一步研究这种变化的机制,并试图找到更直接的环境参数来指示夏季风发生前后分布格局的变化。该研究还证实了t.o octacantha和s.a glacialis可能是热带地区上升流过程的代表。
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引用次数: 3
SEA SURFACE TEMPERATURE VARIATIONS IN THE NORTHERN PHILIPPINE SEA SINCE 19 CAL KABP: SEA SURFACE TEMPERATURE VARIATIONS IN THE NORTHERN PHILIPPINE SEA SINCE 19 CAL KABP 19 CAL kabp以来菲律宾北部海的海表温度变化:19 CAL kabp以来菲律宾北部海的海表温度变化
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04123
Wu Yong-hua, Z. Jian, Xuefa Shi, Zhenbo Cheng, Xiaoyan Li, F. Shi
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引用次数: 1
COCCOLITHOPHORE RECORDS AND THEIR RESPONSE TO PALEOCLIMATIC AND PALEOENVIROMENTAL CHANGES IN SULAWESI SEA FROM THE LAST DEGLACIAL: COCCOLITHOPHORE RECORDS AND THEIR RESPONSE TO PALEOCLIMATIC AND PALEOENVIROMENTAL CHANGES IN SULAWESI SEA FROM THE LAST DEGLACIAL 苏拉威西海末次冰期球石团记录及其对古气候古环境变化的响应:苏拉威西海末次冰期球石团记录及其对古气候古环境变化的响应
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04131
Xiaobo Jin, Chuanlian Liu, Zhihui Chu
{"title":"COCCOLITHOPHORE RECORDS AND THEIR RESPONSE TO PALEOCLIMATIC AND PALEOENVIROMENTAL CHANGES IN SULAWESI SEA FROM THE LAST DEGLACIAL: COCCOLITHOPHORE RECORDS AND THEIR RESPONSE TO PALEOCLIMATIC AND PALEOENVIROMENTAL CHANGES IN SULAWESI SEA FROM THE LAST DEGLACIAL","authors":"Xiaobo Jin, Chuanlian Liu, Zhihui Chu","doi":"10.3724/SP.J.1140.2012.04131","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2012.04131","url":null,"abstract":"","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"32 1","pages":"131-137"},"PeriodicalIF":0.0,"publicationDate":"2013-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69772007","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}
引用次数: 0
LATE QUATERNARY COCCOLITH PRODUCTIVITY IN THE NORTHERN SOUTH CHINA SEA: LATE QUATERNARY COCCOLITH PRODUCTIVITY IN THE NORTHERN SOUTH CHINA SEA 南海北部晚第四纪球粒岩生产力:南海北部晚第四纪球粒岩生产力
Pub Date : 2013-02-07 DOI: 10.3724/SP.J.1140.2012.04009
Juan He, Li Li, Hui Wang, Meixun Zhao
{"title":"LATE QUATERNARY COCCOLITH PRODUCTIVITY IN THE NORTHERN SOUTH CHINA SEA: LATE QUATERNARY COCCOLITH PRODUCTIVITY IN THE NORTHERN SOUTH CHINA SEA","authors":"Juan He, Li Li, Hui Wang, Meixun Zhao","doi":"10.3724/SP.J.1140.2012.04009","DOIUrl":"https://doi.org/10.3724/SP.J.1140.2012.04009","url":null,"abstract":"","PeriodicalId":18188,"journal":{"name":"Marine Geology & Quaternary Geology","volume":"32 1","pages":"9-16"},"PeriodicalIF":0.0,"publicationDate":"2013-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69771519","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}
引用次数: 1
期刊
海洋地质与第四纪地质
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