Superse- quence I is made up of A (T_0-T_1), B (T_1-T_2) and C (T_2-T_3) sequence members, it mainly formed in the basin's wholly subsidence stage, the regional cap rock of Wan' an basin occurs in sequence B_5 and B_4 of the sequence Member B.
We shall construct a generating set of a nonfinitely generated Ga-invariant ring given in Freudenburg's counterexample by making use of an integral sequence which was constructed inductively by Freudenburg.
The classical Rudin-Shapiro construction produces a sequence of polynomials
A Generalized Sampling Theorem with the Inverse of an Arbitrary Square Summable Sequence as Sampling Points
In this article a generalized sampling theorem using an arbitrary sequence of sampling points is derived.
The mathematical concept of frames is utilized in the analysis of the properties of the sequence of sampling functions.
Based on the data from drilling records and experiments, vertical and lateral variations in palaeotopographic strata at the end of later Pleistocene due to sea level flectuation and the resulted different sedimentary bodies in Shanghai region are expounded from a viewpoint of sedimentary differentiation. The Holocene sedimentation is then divided into five sedimentary provinces that belong to two major sedimentation regions.
The coasts from Chengshanjiao to Shidao are located in east Shandong Peninsula, whose geomorphological and sedimentary characteristics may be a type of the irregular coasts developed i nbedrock of Shandong Peninsula.The coasts in studied area can further be subdivided into four types: erosion coast, erosion and deposition coast, graded coast in bay and coast with large tombolo. Differences of coast types directly influence on the source and amount of sediments transported along coast, the variety of coastal...
The coasts from Chengshanjiao to Shidao are located in east Shandong Peninsula, whose geomorphological and sedimentary characteristics may be a type of the irregular coasts developed i nbedrock of Shandong Peninsula.The coasts in studied area can further be subdivided into four types: erosion coast, erosion and deposition coast, graded coast in bay and coast with large tombolo. Differences of coast types directly influence on the source and amount of sediments transported along coast, the variety of coastal sand bodies and the development stages of barrier-lagoon systems. The barrier-lagoon depositional systems are more important in coastal sedimentary units, distributed mainly in bays of Rongcheng, Sanggou, Shidao and tombolo areas of Moye Island and Chudao Island. Barrier-lagoon depositional system consists of three subdivisions: barrier bar, bay in front of the bar and lagoon at the back of the bar. The distribution of sediments in bays is controlled by hydrodynamics and postglacial sealevel fluctuations. In nearshore zones of the bays clay and sandy clay are usually found, this may be caused by circulated tidal currents. The heavy minerals in the bays are the same as those in adjacent lagoon and barrier, but their percentage is different, meaning variety of the hydrodynamics in these sedimentary units. In these bays with salinity of 32-33‰, the microfauna are characterized by neritic environment. The grain size distribution and heavy mineral assemblage in barrier are controlled by bedrocks. In north area of studied coast, where granites are distributed, the bars consist of coarse sands and fine gravels. Epidotes and hornblende predominate in heavy minerals. In middle area where metamorphic rocks outcrop, the barrier bars are composed of medium and coarse sands, and the percentage of hornblende may be above 60%. In south area where the sienites outcrop, the bars consist mainly of medium sands, and the heavy mineral assemblage is characterized by zircon, titanioferrite, and magnatite. The medium and large scale cross-beddings with low angles seawards dipping appear in the bars, in which heavy minerals, shell debris, gravels, and inverse graded bedding are common. The beddings in the bar crest show arch shape, or cross in pyramid shape. In the bar lee the parallel beddings and landward dipping stratifications with high angles appear. The lagoon in studied area can be divided into two types: enclosed and semi-enclosed. The mud deposits increase and salinity decrease with lagoon enclosing. In some semi-enclosed lagoons reworked by human, however, the salinity can be up to 37.19-43.24‰, The hyperhaline and hypohaline waters in lagoon directly influence micro-fossil assemblages that are characterized by small amount of microfossil numbers, low species diversity, and abundance of euryhaline elements.The tectorium along the coasts of Rongcheng contains only one bed with marine fossils, which is underlain by weathered crust and composed of transgressive and regressive sequences. The barrier-lagoon sedimentary systems are present in regressive sequence, belong to regressive type. Based upon the data of borings, lagoon deposits are underlain by bay-neritic facies sediment and further divided into bay-lagoon, semi-enclosed lagoon and enclosed lagoon units, therefore, bay-lagoon, semi-enclosed lagoon and enclosed lagoon may be distinguished. The tombolo-lagoon behind Moye Island and Chudao Island have been formed, or lagoon sediments are preserved. The tombolo development behind large islands may be one of the ways of barrier-lagoon system formation.
The field investigations of hydrology and sediment in estuaries of the Changjiang(Yangtze), Nanliujiang and Qiantangjiang Rivers show that flood tidal current is themain agent of upstream transporting sediment. The "light" and heavy mineralsupstream transported may be represented, respectively, by foraminifera and saponite,which have been found not only in distributaries, but also in Holocene sedimentarybeds of deltas. The study of upstream transportation of marine fossils and marineauthigenic minerals, such...
The field investigations of hydrology and sediment in estuaries of the Changjiang(Yangtze), Nanliujiang and Qiantangjiang Rivers show that flood tidal current is themain agent of upstream transporting sediment. The "light" and heavy mineralsupstream transported may be represented, respectively, by foraminifera and saponite,which have been found not only in distributaries, but also in Holocene sedimentarybeds of deltas. The study of upstream transportation of marine fossils and marineauthigenic minerals, such as saponite has further interpreted the formation of post-glacial transgressive river-channel fill sequence in the Changjiang (Yangtze) RiverDelta area and some problems of Holocene transgression in the Taihu area.
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