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81.
N. V. Goreva A. S. Alekseev T. N. Isakova O. L. Kossovaya 《Stratigraphy and Geological Correlation》2009,17(1):43-61
Micro- and macrofauna remains were studied from transitional deposits of Moscovian and Kasimovian Stages in the Donskaya Luka (Volgograd Region). The preliminary analysis of microfauna showed that “sub-Triticites Beds” of the Donskaya Luka contain fusulinid and conodont assemblages enabling correlation of the Middle and Upper Carboniferous deposits in the study region with the type sections of Moscow area and Donbass. Conodonts from the “sub-Triticites Beds” stratotype were studied for the first time. As is established, upper part of the Sukhov Fm. and the base of the Seleznev Fm. belong to the Protriticites pseudomontiparus-Obsoletes obsoletus Zone. Based on fusulinids, higher parts of the Seleznev Fm. belong to the Montiparus Zone of the Khamovnikian Substage, whereas conodonts suggest their correlation with lower part of the Khamovnikian Substage, i.e., with the Ratmirovo Fm. or a basal part of the Neverovo Fm. Middle part of the Seleznev Fm. is correlated to middle cycle of the Neverovo Fm. of the Khamovnikian Substage in Moscow area. The Middle-Upper Carboniferous boundary deposits of the Donskaya Luka are represented by deposits of extremely shallow-water settings and contain only sporadic microfauna. These sections cannot be considered as possible candidates for the GSSP of the Kasimovian Stage base. 相似文献
82.
Bermuda is a reef atoll along the northern edge of Caribbean coral province. Although investigated by seismic and some shallow drilling, the Pleistocene marine depositional geohistory is poorly constrained. Islands along the southern rim are built by tropical calcareous aeolianites that range in age from Holocene to early Pleistocene (ca 880 kyr). These dunes are composed of particles that were derived from adjacent Pleistocene marine environments at the time of formation. Thus, the aeolianites should contain a record of marine deposition through the Early to Late Pleistocene. Carbonate grains from all aeolian deposits can, via Ward cluster analysis, be separated into two distinct groups: (i) a Halimeda‐rich group; and (ii) a crustose coralline‐rich group. Distribution of these two groups is interpreted to broadly reflect low‐energy (lagoonal) and high‐energy marginal reef (coralline algae and cup‐reef) environments, respectively. Unlike the beach sources, coral particles are perplexingly absent in the aeolianites. This conundrum is interpreted to partly reflect the domal nature of Bermudan corals, which are not incorporated into aeolian deposits due to their relatively large size. Aeolianites from Marine Isotope Stages 7, 9 and 11 record sediments produced in adjacent shallow marine settings that were similar to those present today. The spatially consistent sediment trends are not, however, present in aeolianites from Marine Isotope Stage 5E, where the aeolian bioclastic components are uniformly rich in Halimeda along both southern and northern shores. Such a distribution, where coralline‐rich sediments would be expected, suggests an extrinsic oceanographic control, interpreted herein to be elevated seawater temperature brought in by the Gulf Stream. This interpretation is consistent with palaeozoological studies of Bermuda, as well as North America, the Mediterranean, Japan and Western Australia. 相似文献
83.
随着近海渔业资源的枯竭及近海养护政策的进一步实施,发展远洋渔业成为增加海水产品供给、改善居民膳食结构、实现我国渔业可持续发展的战略选择。文章回顾了新中国成立以来我国远洋渔业的发展历程:按照产量、产值、作业海域、远洋渔业产业结构等指标对其进行阶段划分,依次分为空白期(1949—1971年)、积极筹备期(1972—1984年)、起步期(1985—1990年)、快速发展期(1991—1997年)、调整期(1998—2006年)、优化期(2007年至今)6个阶段,并分析其阶段特征;发现国际渔业合作、远洋技术革新、近海渔业政策和政府补贴引导构成了远洋渔业不同阶段的演进动因。结合当前我国远洋渔业所处阶段的特征和国内外渔业环境,对我国远洋渔业的发展趋势进行预测,即我国远洋渔业发展趋势体现在如下三大转变,(1)由渔业资源依附型转变为科技资源驱动型;(2)资源消耗型转变成资源创造型,推进海外"蓝色粮仓"建设;(3)资源破坏型转变为资源养护型,树立负责任远洋渔业大国的形象。 相似文献
84.
简要回顾了中国早石炭世早期地层“阶”和“亚阶”划分的历史沿革,阐述了划分的基本原则,即在全球性或大区域性关键地质事件和生物进化事件研究的基础上,将“阶”和“亚阶”的底界应置于地质事件之后某一或某些主导生物门类谱系演化的分支点上,且以某一主导生物门类的新分子在谱系中的首次出现来定义。根据地层的分布和发育特征,拟将中国早石炭世地层分为岩关阶和大塘阶2个阶,其中岩关阶可分为3个亚阶:塘林冲村亚阶、大圩镇亚阶和小圩镇亚阶。岩关阶的底界以牙形刺Siphonodella sulcata的首次出现来确定,与现行的国际泥盆—石炭系界线相一致;岩关阶的顶界以牙形刺Gnathodus homopunctatus的首次出现来确定,略高于现行的由有孔虫定义的国际杜内—维宪阶界线位置。认为现行的国际杜内—维宪阶界线没能规避岩关阶晚期事件(海平面下降事件)的影响,大量以Eoparastaffella为代表的底栖有孔虫的出现正是此次事件的产物。 相似文献
85.
华北地区寒武系中发育有大量的风暴沉积,对于此类沉积物的成因前人意见趋于统一,但对其沉积环境的认识仍存在较多争议。在野外细致观察、实测的基础上,结合室内沉积学描述和分析,在北京西山下苇甸剖面寒武系第三统和芙蓉统内识别出5种沉积相类型,并根据沉积环境将其归入3种相组合,分别形成于浅海碳酸盐缓坡潮下带、深潮下带和页岩盆地环境。在研究地层内,共识别出了49层风暴沉积,基于沉积结构和构造特征,这些风暴沉积层可归入4个风暴沉积大类(原地未破碎风暴沉积、原地破碎风暴沉积、近源风暴沉积、远源风暴沉积)和12个亚类,这些风暴沉积类型形成于不同的环境。根据风暴沉积亚类在地层中的分布规律及其所指示的环境类型,恢复了北京西山寒武纪中晚期相对海平面的变化历史。通过与用不同方法恢复的北京西山和鲁西地区同时期海平面变化曲线进行对比,发现利用风暴沉积类型所恢复的海平面变化曲线与使用正常沉积类型恢复的海平面变化曲线具有相同的变化趋势。因此,风暴沉积类型可以用于恢复长时间尺度的海平面变化趋势。 相似文献
86.
87.
88.
D. A. T. Harper 《Geological Journal》1982,17(4):251-277
The Drummuck Group of the Girvan district (S. W. Scotland) comprises a varied sequence of marine siliciclastic sedimentary rocks some 350 m thick and ranging in age from early Cautleyan to late Rawtheyan (Ashgill Series). Deposition in an unstable slope environment is envisaged. These upper Ordovician rocks crop out in the centre of the Craighead inlier, north of the Girvan valley and are sporadically exposed and locally very fossiliferous. A detailed revision of the Drummuck rocks has permitted, for the first time, the formal lithostratigraphical division of the group. Four main units, in ascending order, the Auldthorns, Quarrel Hill, Lady Burn and South Threave formations are recognized and, within these, a number of smaller, useful divisions are defined. Detailed geological maps of the Drummuck outcrop are presented. Brachiopods numerically dominate the shelly faunas and all the divisions named are characterized by distinctive brachiopod assemblages. Preliminary correlations are discussed with selected upper Ordovician successions elsewhere but the emphasis of this study is placed upon the establishment of a stratigraphical framework within which future detailed research on the Drummuck faunas may be carried out. 相似文献
89.
中国第一个“金钉子”剖面的建立 总被引:17,自引:5,他引:12
中国浙江常山黄泥塘发育了穿越中奥陶统达瑞威尔阶底界的连续地层剖面,笔石和牙形刺的连续演化序列使之得以成为全球对比的标准。经国际地层委员会奥陶系分会、国际地层委员会和国际地科联邮投和批准,已成为达瑞威尔阶的全球层型剖面点。 相似文献
90.
A one year long monthly sampling series at a fixed station was combined with a high-spatial resolution survey (May 2003) to investigate factors controlling zooplankton distribution in the south-eastern corner of the Bay of Biscay. Species abundance and gonad maturity for Calanoides carinatus and Calanus helgolandicus were estimated to clarify whether the observed spatial patterns were attributable to increased population growth or to mechanical accumulation. The two studies included distinct oceanographic regimes. The eastern corner of the grid was characterized by Adour river plume waters and the Cap Breton canyon, and the rest of the area by an alternating pattern of physical convergences and divergences. In the river plume, the zooplankton community diversity and abundances were highest in response to the nutrient enriched river plume waters and the submarine canyon. In the rest of the area, distribution and abundance patterns were the result of a combination of behaviour and physical transport. 相似文献