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31.
Authigenic carbonates associated with cold seeps provide valuable archives of changes in the long-term seepage activity. To investigate the role of shallow-buried hydrates on the seepage strength and fluid composition we analysed methane-derived carbonate precipitates from a high-flux hydrocarbon seepage area (“Batumi seep area”) located on the south-eastern Black Sea slope in ca. 850 m. In a novel approach, we combined computerized X-ray tomography (CT) with mineralogical and isotope geochemical methods to get additional insights into the three-dimensional internal structure of the carbonate build-ups. 相似文献
32.
Denis Lavoie Nicolas Pinet Mathieu Duchesne Andrée Bolduc Richard Larocque 《Marine and Petroleum Geology》2010
Nearly 2000 pockmarks with diameters ranging from a few tens of meters up to 700 m are present on the seafloor of the St. Lawrence Estuary in eastern Canada. Coring of some pockmarks resulted in the recovery of various-sized and shaped carbonate concretions in a predominantly silty mud matrix. Petrographic and geochemical data on four authigenic carbonate concretions are reported as well as data from shell material in the unconsolidated sediment. Video observations and echo-sounder images indicate that the sampled pockmarks are actively gas venting. The video images show significant look-alike microbial mats in areas where gas is venting. The carbonate concretions are primarily made up of carbonate cements with varying percentage of shell fragments, micrite particles and fine-grained clastics. Orthorhombic crystal morphology and diagenetic fabrics including isopachous layers and botryoids characterize the aragonite cement. Oxygen isotopes ratios for the cement crusts do not record any thermal anomaly at the site of precipitation with δ18OVPDB ratios (+3‰) in equilibrium with cold (5 °C) deep marine waters, whereas significant negative δ13CVPDB ratios (−9.9 to −33.5‰) for cement and shell material within concretions indicate that the carbonates largely derive from the microbial oxidation of methane. The δ13CVPDB ratios of aragonite shells (−2.7 to −5.6‰) taken from unconsolidated sediments at some distance from the concretions/vents show variable dilution of HCO3− with negative δ13CVPDB ratios derived from microbial oxidation of methane with isotopically normal (0‰) marine bicarbonate. These results are in agreement with other lines of evidence suggesting that pockmarks formed through the recent and still active release of gas from a reservoir within the Paleozoic sedimentary succession. 相似文献
33.
Li Peixian Su Deying Li Yougui Yu JingxianInstitute of Geology Chinese Academy of Geological Sciences Beijing 《《地质学报》英文版》1994,68(3):329-349
In the Yanliao area, the occurrence of the Nestoria-Keratestheria fauna and the Eoparacypris- Luanpingella-Darwinula assemblage in the Dabeigou Formation s.s., a Rb-Sr isochron age of 145.2 Ma for the Baiqi Formation and a complete stratigraphic sequence-all this proves that the Lycoptera-bearing bed overlies the Upper Jurassic. The Jehol fauna comprises the primitive Trigonioidids fauna, Eosestheria fauna, Lycoptera fauna et al., and their own laws of evolution expound that they belong to Cretaceous faunas. The associations of Eosestheria with Yanjiestheria, Lycoptera with Eosestheria, and Kuntulunia with Yanjiestheria as well as the occurrence of early angiosperms and sporo - pollen in the Fuxin Formation and its equivalents also demonstrate that the Lycoptera-bearing, bed should be assigned to the Cretaceous. The confirmation of the existence of Aucellina in the Jixi Group and the correlation of Trigonioidids and Cypridids with those in the equivalent strata of Japan and Western Europe have also been 相似文献
34.
甘肃的寒武系 总被引:1,自引:0,他引:1
寒武系主要分布于北山、祁连山、河西走廊及陕甘宁盆地。根据沉积岩相及动物地理区系分为三大沉积区和7个沉积分区:北山沉积区分为下统双鹰山组、中统大豁落井组、上统西双鹰山组;祁连山沉积区未见下统,中统月牙山群、黑茨沟群和格尔莫沟群,上统香毛山群;华北沉积区下统未分,中统毛庄组、徐庄组和张夏组,上统仅见崮山组。三大沉积区的动物群分别为东南型(除早寒武世外)、过渡型和华北型。寒武系下界相当于滇东的沧浪铺阶之底界,并与震旦系冰碛层呈平行不整合接触。寒武纪岩相古地理轮廓受当时的地壳变动和气候条件所控制。早寒武世中晚期开始海侵,在北山沉积区之西部呈海湾,在陕甘宁盆地西缘呈浅海陆棚,省内其余地区(除西秦岭外)呈古陆状态。中寒武世广泛海侵,在祁连山形成海槽,且地壳运动加剧,火山喷发活动频繁。晚寒武世大规模海退,仅在北山局部地区、祁连山西段和陕甘宁盆地有沉积,其余均为古陆状态。 相似文献
35.
MASATOSHI GOTO 《Island Arc》1994,3(4):247-254
Abstract In recent years, many fish teeth and scales have been found from the Palaeozoic and Mesozoic age strata of the Japanese Islands. This study is a compilation of the Japanese fish record from the Palaeozoic and early Mesozoic age deposits. Based on the published and unpublished data, the fossil fishes from the Palaeozoic and Early Mesozoic of Japan can be classified into 27 genera and 33 species, that is, one species of Devonian placoderms, 19 species of Permian to Jurassic elasmobranchs, three species of Permian cochliodonts, seven species of Carboniferous to Permian petalodonts, and three species of Triassic to Jurassic osteichthyans. 相似文献
36.
本文记述了采自山东淄博地区晚石炭世太原组双壳类化石15属28种,讨论了化石组合特征.在研究双壳类动物群的基础上,划分了3个动物群落,即:Acanthopecten群落、Palacolima群落和Aitartella群落,并对各群落的生态特征进行了系统研究. 相似文献
37.
新疆寒武纪三叶虫动物群可分为三个生物地理区:1.天山型动物群——博罗科努山区;2.华北型动物群——柯坪区;3.过渡型(库鲁克塔格型)动物群——库鲁克塔格区.库鲁克塔格寒武纪三叶虫动物群序列自下而上可分出13个化石带:下寒武统西大山组2个带;中寒武统莫合尔山组4个带;上寒武统突尔沙克塔格组7个带. 相似文献
38.
39.
吉林延边开山屯地区地层时代的新证据 总被引:10,自引:1,他引:10
吉林延边开山屯地区古生代地层,在构造地层学研究的基础上,取得一些地层时代的新资料在混杂岩中新发现中二叠世北方型动物群化石;对混杂岩中的花岗岩砾石,测得SHRIMP锆石U-Pb年龄(286.8±5.6Ma),代表岛弧岩浆岩结晶时间;在变蛇绿岩和糜棱岩中采取白云母样品,测得40Ar-39Ar年龄,分别为408Ma和205.7Ma。由此,可以得出开山屯地区地层时代和混杂岩形成与演化的时间表泥盆纪洋壳形成;在中石炭世—中二叠世由南向北的运移过程中,洋壳之上发生硅质和碳酸盐沉积,形成海山;洋壳与由北向南移动的兴凯地块相对运动,二叠纪时向大陆俯冲,在兴凯地块西缘(现代方位)发育岛弧活动,并在中、晚二叠世形成滑塌堆积。可能与晚三叠世的洋壳俯冲作用有关,在兴凯地块前陆边缘发生逆冲作用,形成构造岩片。 相似文献
40.
南京直立人研究的新进展 总被引:1,自引:0,他引:1
简单地介绍了“南京直立人(猿人)综合研究专家组”近二年来的部份研究成果,如南京汤山葫芦洞内的地层可以分为4段;洞内的哺乳动物群可以分为时代不同的大洞动物群和小洞动物群;南京直立人的一号头骨与二号头骨层位不同,特征也不一;铀系测年也证明小洞的地层其年代在距今60万年-50万年间,大洞的地层年代在距今24万年-10万年间,大洞被堆石堆砾石层封闭的时间应在13万年-10万年间。从而补充和纠正了前人研究中的不足和错误。 相似文献