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Productivity in the Southern Ocean Antarctic Zone during the Northern Hemisphere Glaciation(NHG)and its link to atmospheric pCO_(2)

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Science China Earth Sciences 2024年第7期67卷 2242-2252页

作者： Yiming WU Jingteng GUO Xiangyu ZHAO Wenshen XIAO Heng liU Zhifang XIONG tiegang li Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Laboratory for Marine Geology Laoshan LaboratoryQingdao 266237China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200030China Key Laboratoryof Polar Ecosystem and Climate Change Shanghai Jiao Tong UniversityMinistry of EducationShanghai 200030China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China

A decrease in atmospheric CO_(2)partial pressure(pCO_(2))is considered an important prerequisite for the onset and intensification of Northern Hemisphere Glaciation(NHG).However,how the ocean sequestered missing CO_(2)during the NHG is still *** in surface productivity and deep ventilation in the Southern Ocean(SO)have been proposed to explain the variations in atmospheric pCO_(2)over the last eight glacial cycles,but it is unclear whether these mechanisms contributed to the decrease in atmospheric pCO_(2)during the *** titanium-normalized contents and mass accumulation rates of biogenic opal and total organic carbon from the International Ocean Discovery Program(IODP)Expedition 374 Site U1524A,we reconstruct the productivity in the Ross Sea,Antarctica,from 3.3 Ma to 2.4 *** productivity records exhibit a long-term decreasing trend and several distinct phased evolutionary ***,the local productivity fluctuated dramatically during 3.3-3.0 Ma,decreased gradually during 3.0-2.6 Ma,and remained relatively constant during 2.6-2.4 *** comparing productivity with its potential influences,we infer that the phased and long-term evolutions of productivity were mainly controlled by changes in deep ocean *** ice expansion might have decreased productivity during 3.3-3.0 Ma by light *** in eolian dust input have little effect on *** analysis revealed no coupling linkage between productivity and atmospheric pCO_(2),indicating that the productivity in the SO Antarctic Zone(AZ)was not the main factor controlling the atmospheric CO_(2)decrease during the *** improve our understanding of the role of SO processes in the NHG,further studies should focus on the potential influences of deep ocean ventilation on atmospheric pCO_(2)in the AZ,and similar studies should also be extended to the sea area in the Subantarctic Zone.

关键词： Ross Sea Biogenic opal Total organic carbon Deep ocean ventilation Sea ice Ocean carbon cycle

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Provenance of colorless and brown volcanic glass in late Pleistocene tephra layers in the Western Philippine Sea

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Journal of Oceanology and limnology 2024年第05期 1438-1449页

作者： Fuqing JIANG Zhishun ZHANG Zhaohui ZHANG Guoliang ZHANG Peng HUANG Xiaojing ZHOU Zhifang XIONG Congying li tiegang li Key Laboratory of Ocean Observation and Forecasting and Key Laboratory of Marine Geology and Environment Institute of Oceanology Chinese Academy of Sciences Laboratory for Marine Geology Qingdao Marine Science and Technology Center University of Chinese Academy of Sciences Institute of Marine Chemistry and Environment Ocean College Zhejiang University College of Marine Technology and Environment Dalian Ocean University Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of Oceanography Ministry of Natural Resources

Tephra layers in the western Philippine Sea,characterized by abundant volcanic glass shards,may provide crucial evidence on the eruption history of volcanoes and tectonic evolution of the western Pacific.A 220-ka sediment core from the Benham Rise in the western Philippine Sea offers new insights into the provenance of four intercalated tephra layers （T1–T4,in chronological order） containing either colorless or brown glass *** to primitive mantle,all glass shards are enriched in large-ion lithophile elements,such as Rb,Cs,and Pb,and depleted in high field-strength elements,such as Th,Nb,and Ta,indicating a subduction-related *** colorless glass shards are characterized by high SiO2（>78%） and light rare earth element （LREE） contents as well as high La/Sm ratios （>9）,low FeO and MgO contents （100）,pointing to a rhyolitic composition and a medium-K calc-alkaline serial *** contrast,the brown glass shards are characterized by lower SiO2（line andesite *** glass shards from layers T3 （152 ka） and T4 （172 ka） were correlated with volcanic deposits from the Taal and Laguna Caldera in the Maccolod Corridor,respectively,while the colorless glass shards from layers T1 （36.5 ka） and T2 （61.2 ka） were likely sourced from the Irosin Caldera in the Bicol *** the provenance of late Pleistocene tephra layers in the western Philippine Sea is helpful to complement a Philippine volcanic history and establish a regional tephrochronostratigraphy.

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冰期旋回中热带西太平洋碳源汇过程、机理与效应

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科学通报 2024年第13期69卷 1742-1758页

作者：李铁刚熊志方秦秉斌贾奇郭景腾自然资源部第一海洋研究所海洋地质与成矿作用重点实验室青岛266061 崂山实验室海洋地质过程与环境功能实验室青岛266237

冰期旋回是第四纪地球气候变化最显著的特征,热带西太平洋通过水文循环控制全球气候演化,这是“气候演变低纬驱动”理论的核心内容.由于现代热带西太平洋CO_(2)总体上处于海-气平衡,因此基于“将今论古”的思想,长期以来学术界认为热带... 详细信息

冰期旋回是第四纪地球气候变化最显著的特征,热带西太平洋通过水文循环控制全球气候演化,这是“气候演变低纬驱动”理论的核心内容.由于现代热带西太平洋CO_(2)总体上处于海-气平衡,因此基于“将今论古”的思想,长期以来学术界认为热带西太平洋相对于南大洋等高纬海区在大气CO_(2)分压(pCO_(2))冰期旋回中的作用并没那么重要,从而低估了热带西太平洋通过碳源汇演替调控全球气候的作用.在综合分析上新世以来冰期旋回中热带西太平洋碳源汇过程与机制的基础上,总结出了其气候效应模式,发现冰期时海平面降低导致更多的河流营养物进入海洋,致使近海表层有机碳生产和海底有机碳埋藏加强;同时,远洋为了“补偿”陆架珊瑚礁等钙质生物碳酸盐生产的减少,引起其深部CO32和碱度增加,致使远洋深部碳库增强;另外,开放洋区大型硅藻勃发等有机碳生产演化事件在大洋深部形成呼吸碳库,进一步“放大”了上述增强的深部碳库.这些碳循环过程表明冰期热带西太平洋扮演碳汇角色.间冰期时上述碳循环过程发生的方向或强度与冰期相反,但目前还没有证据证明间冰期热带西太平洋是否扮演碳源角色;尽管冰消期,其确实能向大气释放CO_(2).此外,叠加在冰期旋回之上的长尺度记录以及跨越冰期旋回的重大事件记录均显示,热带西太平洋可以通过全球的遥相关或洋际交换,在深部“被动”形成碳库.但这种“被动”形成的深部碳库是否也发生在冰期旋回中还有待于进一步证实.总之,热带西太平洋碳循环也同水文循环一样,通过碳源汇演替对冰期旋回中大气pCO_(2)和全球气候产生重要影响,从而丰富了“气候演变低纬驱动”理论的内涵.

关键词：表层海洋固碳深部海洋储碳海平面风尘碳循环上新世以来

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还原性矽卡岩型金矿床基本特征、研究现状及在中国前景

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矿床地质 2024年第1期43卷 1-28页

作者：刘军王晓彤何军成李铁刚中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室北京100037 中国地质大学(北京)地球科学与资源学院北京100083

还原性矽卡岩型金矿以独立金矿形式赋存于钙质沉积岩中,以金品位高(5~15 g/t)著称。目前,该类型金矿的总体研究程度较低,在成矿背景、还原性岩浆源区及成因、金高效富集机制等方面仍缺乏理解。笔者对该类型金矿的地质特征、时空分布规... 详细信息

还原性矽卡岩型金矿以独立金矿形式赋存于钙质沉积岩中,以金品位高(5~15 g/t)著称。目前,该类型金矿的总体研究程度较低,在成矿背景、还原性岩浆源区及成因、金高效富集机制等方面仍缺乏理解。笔者对该类型金矿的地质特征、时空分布规律、成矿机理、找矿标识等方面进行了系统梳理,探讨了该类金矿的研究难点及其在中国的成矿潜力和找矿前景。还原性矽卡岩型金矿具有以下特征:(1)独特的Au-Bi-Te-As±Co元素组合,缺乏Cu等贱金属;(2)矽卡岩以钙铁辉石为主,其次为石榴子石;(3)成矿岩体属于还原性钛铁矿系列,包括辉长闪长岩、闪长岩和花岗闪长岩等;(4)代表性低硫逸度的金属矿物,包括斜方砷铁矿、黑铋金矿、贫S的Te-Bi矿物。关键问题或薄弱环节主要有:(1)还原性岩浆存在温度、盐度、氧逸度、硫逸度、含水量、还原性组分类型及含量等多种属性,这些属性对还原性矽卡岩型金矿的形成有哪些影响?(2) Au可能以氯络合物、硫络合物、Bi-Te熔体、纳米絮状物等多种方式运移,还原性岩浆流体中Au的高效迁移及富集方式有哪些?(3)还原性成矿岩浆的氧化-还原性质有争议,部分学者认为岩浆始终为还原性,另一些学者认为母岩浆为氧化性,后期混入还原性物质;(4)存在深部W-Mo矿化、浅部Au-Sb-Bi矿化的金属元素分带现象,这种分带规律受哪些因素控制?总之,还原性矽卡岩型金矿在中国有着良好的成矿潜力和找矿前景,其中中国东部W/Sn成矿区(带)和Au成矿区(带)的叠加区域、西部还原性岩体分布区是该类金矿的有利勘探区。

关键词：还原性岩浆矽卡岩金矿床岩浆成因成矿机制

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Morphology of four Miliolinella species (Foraminifera, Protozoa) with description of a new species, Miliolinella obesa nov. spec., from the tropical West Pacific Ocean

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Acta Oceanologica Sinica 2018年第10期37卷 64-69页

作者： LEI Yanli li tiegang Department of Marine Organism Taxonomy and Phylogeny Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 China Key Laboratory of Marine Sedimentology and Environmental Geology the First Institute of Oceanography State Oceanic Administration Qingdao 266061 China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology (Qingdao) Qingdao 266061 China Center for Ocean Mega-Science Chinese Academy of Sciences Qingdao 266071 China University of Chinese Academy of Sciences Beijing 100049 China

Foraminiferal oozes were sampled from the tropical West Pacific seamount and seabed of deep sea, by a remotely operated vehicle （ROV） in December 2014 and March 2016. Using standard morphological method, four Miliolinella species, including Miliolinella obesa, M. circularis, M. suborbicularis and M. subrotunda were described. Among the four species, M. obesa is a new species. It is a large member （about 500 μm in length） of the genus. This species is characterized by having a very stout and transverse broadly circular outline, and its body width is greater than the body length. In addition, its chamber demarcations are obscure from the exterior appearance. Three chambers are unclearly visible on one side and two chambers are visible on the opposite. Finally, we provided very detailed taxonomic microphotographs and the ecological distribution information for each species.

关键词： deep sea foraminifera Miliolinella seamount seabed West Pacific Ocean

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Climate evolution of southwest Australia in the Miocene and its main controlling factors

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Science China Earth Sciences 2022年第6期65卷 1104-1115页

作者： Tianqi SUN Zhaokai XU Fengming CHANG tiegang li Key Laboratory of Marine Geology and Environment Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Geology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266061China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excellence in Quaternary Science and Global Change Xi’an 710061China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Sedimentology and Metallogeny First Institute of OceanographyMNRQingdao 266061China

At present, the seasonal melting and expansion of the Antarctic ice sheet affect the location and intensification of the westerlies, as well as the precipitation and continental weathering and erosion in southwest Australia. The Miocene was an important period when the Earth's climate state transitioned from a warmhouse to an icehouse and the East Antarctic Ice Sheet underwent large-scale melting and expansion. At that time, Australia was closer to the Antarctic region than it is now. This makes Australia an ideal target area for studying the coupling relationship among the atmosphere, hydrosphere, lithosphere, and cryosphere. Based on the comprehensive analysis of the siliciclastic mass accumulation rate, grain size, clay minerals, and elemental composition of the sediments at Site U1516 of the International Ocean Discovery Program Expedition 369, we reconstructed the Miocene climate evolution and the continental weathering and erosion history of southwest Australia on a tectonic time scale. Our indicators show that the climate was dry and that continental weathering and erosion were weak, with a small amount of terrestrial material transported to the ocean during the Early to Middle Miocene(22–12.7 Ma). However, as mentioned in previous studies of nearby sites, precipitation and river runoff increased prominently with enhanced continental weathering at 12.7–8 Ma, which was related to the northward migration or intensification of the westerlies, possibly due to increased sea ice in the Southern Ocean. In addition, we found that the evolution of the South Asian monsoon and the westerly belt were synchronized in the Miocene, which indicates that the South Asian monsoon system at that time may also have been affected by the high-latitude signals of the Southern Hemisphere. We speculate that the significant decrease in deep-sea temperature and the expansion of the surface sea temperature gradient in latitude and longitude until the permanent East Antarctic Ice Sheet fo

关键词： Miocene Southwest Australia Climate evolution Controlling factors International ocean discovery program

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冰期旋回中南大洋与热带太平洋相互作用过程与机制

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极地研究 2024年第3期36卷 438-453页

作者：熊志方王家凯秦秉斌郭景腾李铁刚自然资源部第一海洋研究所海洋地质与成矿作用重点实验室山东青岛266061 青岛海洋科技中心海洋地质过程与环境功能实验室山东青岛266237

南大洋翻转环流推动南半球高低纬度之间水团的交换,热带太平洋是全球水汽和热量的重要源区,推动着哈德利和沃克环流以及厄尔尼诺-南方涛动(ENSO)等关键过程的发生。这些过程有效地将热量从热带地区传送至高纬度地区,也在年际至年代际时... 详细信息

南大洋翻转环流推动南半球高低纬度之间水团的交换,热带太平洋是全球水汽和热量的重要源区,推动着哈德利和沃克环流以及厄尔尼诺-南方涛动(ENSO)等关键过程的发生。这些过程有效地将热量从热带地区传送至高纬度地区,也在年际至年代际时间尺度上促进了南半球高低纬度之间大气环流的相互作用。热带太平洋与南大洋之间在冰期旋回中呈现出错综复杂的海洋与大气环流间的相互作用,涉及物质、能量与水汽的交换,对全球气候变化产生明显影响。迄今为止,高纬冰芯和沉积岩心记录已深入地揭示了冰期旋回中受类ENSO过程影响出现南大洋海水温度和海冰与南极降雪等的演变过程。同时,热带沉积岩心记录也显示在冰期旋回期间,印度洋-太平洋暖池次表层的升温是南大洋积累的过剩热量,通过浅层翻转环流向北,经由亚热带环流向低纬度传输的结果。这些记录不仅支持南大洋流通性增强会影响低纬度大洋生物地球化学循环的观点,同时也表明冰期旋回中,印-太暖池升温引发的类ENSO式变化可能主导着热带太平洋大气环流模式,并对南大洋地区的大气环流产生影响。然而,由于目前在多时间尺度上与热带遥相关有关的古海洋记录有限,使得目前对南大洋与热带太平洋相互作用过程和机制的理解与评估仍存在诸多不确定性。因此,持续开展多指标环南极柱状沉积物的调查分析工作可以为热带遥相关气候模型提供更真实的环境变化参数,从而减少这些不确定性。

关键词：类ENSO/SAM 大气桥梁海洋隧道热带遥相关古海洋记录南大洋热带太平洋

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Responses of benthic foraminifera to changes of temperature and salinity:Results from a laboratory culture experiment

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Science China Earth Sciences 2019年第2期62卷 459-472页

作者： Shuaishuai DONG Yanli LEI tiegang li Zhimin JIAN Department of Marine Organism Taxonomy & Phylogeny Institute of Oceanology Chinese Academy of Sciences University of Chinese Academy of Sciences Center for Ocean Mega-Science Chinese Academy of Sciences Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of Oceanography SOA Laboratory for Marine Geology Qingdao National Laboratory for Marine Science and Technology State Key Laboratory of Marine Geology Tongji University

The effects of temperature and salinity on intertidal foraminiferal community under laboratory conditions are poorly understood. We designed a two-factor crossed experiment in which foraminiferal communities were cultured at different temperatures (6, 12, and 18℃) and salinities (15, 20, 25, and 30 psu) for 10 weeks. In total, 2616 living (stained) specimens were obtained and analyzed. Foraminiferal abundance ranged from 9 to 202 individuals/10 g wet weight of sediment. The highest abundance was obtained at 12℃, 25 psu and the lowest at 6℃, 15 psu. Statistical results demonstrated that temperature affected foraminiferal community more significantly than salinity. Most foraminiferal community parameters (abundance, species richness, Margalef index, and Shannon-Wiener diversity) were significantly positively correlated to temperature, but not to salinity, whereas Pielou's evenness was significantly negatively correlated to both temperature and salinity. The interactive effect of temperature and salinity on foraminiferal abundance was significant. In addition, with increasing temperature, the species composition shifted from hyaline Rotaliida to porcellaneous Miliolida. The abundance of dominant species (e.g., Ammonia aomoriensis, A. beccarii, and Quinqueloculina seminula) showed significant positive correlations to temperature. Our study indicated that the intertidal foraminiferal community responds sensitively and rapidly to the changes of salinity and, especially,temperature by shifting foraminiferal species composition and altering the community parameters.

关键词： Benthic foraminifera Community parameter Temperature Salinity Culture experiment Intertidal zone

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Changing structure of benthic foraminiferal communities due to declining pH:Results from laboratory culture experiments

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Science China Earth Sciences 2019年第7期62卷 1151-1166页

作者： Shuaishuai DONG Yanli LEI tiegang li Zhimin JIAN Laboratory of Marine Organism Taxonomy and Phylogeny Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMNR.Qingdao 266061China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China Laboratoiy for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266061China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

The ocean absorbs large amounts of CO_2 emitted from human activities, which results in a decrease in seawater p *** calcifying organisms such as foraminifera, are most likely to be affected by this declining pH. In this study, we collected sediments from five stations of different depths(34–73 m) in a continental shelf of the Yellow Sea. The entire benthic foraminiferal communities together with sea sediments were cultured under three constant pHs(8.3, 7.8, and 7.3) for 6 and 12 weeks in the laboratory to study their responses to pH or incubation time. The microcosm's experimental results obtained showed that most of the foraminiferal community parameters(abundance, species richness, Margalef index, and Shannon-Wiener diversity) decreased significantly(pline in pH in all the tested stations. The responses of foraminifera to the decline in p H were species-specific, for instance, Protelphidium tuberculatum and Cribroelphidiumfrigidum were highly sensitive to declining pH and were finally eliminated at low pH, while some species(e.g., Lagenammina atlantica, Verneuilinulla advena, V. propinqua, Haplophragmoides applanata, and H. canariensis) could tolerate low pH and acted as pH-tolerant species. In addition, the proportion of hyaline taxa showed a significant(plined after 6 weeks' incubation under low p H manipulation. Our results indicated that nearshore foraminiferal communities showed rather a resilience to the declining p H and the offshore foraminifera, especially those in the central area of the Yellow Sea Cold Water Mass were found to be more sensitive to the decline in pH in the continental shelf sediments of the Yellow Sea.

关键词： Benthic foraminifera Community pH Laboratory culture experiment Yellow Sea

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NGS-metabarcoding revealing novel foraminiferal diversity in the Western Pacific Magellan Seamount sediments

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Journal of Oceanology and limnology 2021年第5期39卷 1718-1729页

作者： Junfeng SHI Yanli LEI Haotian li tiegang li Laboratory of Marine Organism Taxonomy and Phylogeny Institute of OceanologyChinese Academy of SciencesQingdao 266071China Key Laboratory of Marine Sedimentology and Environmental Geology First Institute of OceanographyMinistry of Natural Resources(MNR)Qingdao 266061China Clinical Research Center Affi liated Hospital of Weifang Medical UniversityWeifang 261031China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519082China Laboratory for Marine Biology and Biotechnology Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Seamount is a unique deep-sea ecosystem widely distributed in the *** biodiversity is vibrant due to its specific geographical and hydrological ***,the diversity and features of foraminifera in such an environment have rarely been *** extracted environmental DNA(eDNA)in sedime nts and amplified the partial small subunit ribo somal DNA(SSU rDNA)of fo raminife ra to understand the foraminiferal diversity from four sites in Magellan Seamount(Western Pacific Ocean).Partial S SU rDNA sequencing was conducted and 912979 foraminiferal reads were obtained and gathered into 266 operational taxonomic units(OTUs).In the available dataset,a high proportion of rare OTUs and low identity OTUs in each studied sample showed that the Magellan Seamount foraminiferal community might have a high genetic *** relative abundance of foraminifera varied between replicates probably due to the existence of bias in amplification process and patchiness of the deep-sea *** showed that the Magellan Seamount has a relatively high benthic foraminiferal diversity characterized mainly by monothalamiids(76.37%of total reads)in association with rotaliids(19.03%of total reads),including planktic foraminiferal sequences(38.58%of rotaliids;7.36%of total reads).The remaining reads were assigned to miliolids(0.83%of total reads)and textulariids(0.66%of total reads),and 3.11%of total reads are unassigned to a specific *** co mparative analysis with foraminiferal assemblage s from coastal and deep-sea environme nts indicated that seamounts could aggregate species from a nearby deep-sea.

关键词： metabarcoding Magellan Seamount foraminifera Western Pacific Ocean

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