【摘要】：華北地臺(tái)寒武系第三統(tǒng),大致包括毛莊組、徐莊組、張夏組和崮山組,在其中上部大面積發(fā)育鮞粒灘相灰?guī)r,從而不符合標(biāo)準(zhǔn)的威爾遜碳酸鹽相帶中"臺(tái)地邊緣顆粒灘相"的概念。在北京西郊下葦?shù)槠拭?基于沉積相序列的層序地層劃分表明,這些鮞粒灘相地層,常常構(gòu)成層序的晚期高水位體系域或強(qiáng)迫型海退體系域,表現(xiàn)出層序地層框架下特別的鮞粒灘形成樣式,成為相對(duì)快速沉降背景下的相對(duì)海平面緩慢下降的沉積響應(yīng),從而不符合標(biāo)準(zhǔn)的層序地層學(xué)模式,因?yàn)樵跇?biāo)準(zhǔn)的層序地層學(xué)模式中沉積作用主要發(fā)生在相對(duì)海平面上升和停滯階段,而且在海平面下降期將形成一個(gè)連續(xù)的侵蝕作用不整合面。再者,與海侵作用期的陸棚相鈣質(zhì)泥巖和深緩坡相條帶狀泥晶灰?guī)r、及其所代表的泥質(zhì)碳酸鹽沉積物主導(dǎo)的淺海陸架型臺(tái)地相對(duì)應(yīng),強(qiáng)迫型海退過(guò)程之中發(fā)育的大面積分布的鮞粒灘,代表著寒武紀(jì)類型多樣的碳酸鹽臺(tái)地類型中的一種新的碳酸鹽臺(tái)地類型,即鮞粒砂所主導(dǎo)的淺海碳酸鹽陸架為特征的一種特別的碳酸鹽臺(tái)地,即淺海陸架被顆粒質(zhì)的鮞粒沉積物大面積覆蓋,向海一側(cè)為緩坡、向陸一側(cè)為潮坪。所以說(shuō),北京西郊下葦?shù)槠拭娴暮湎档谌y(tǒng),鮞粒灘的層序地層位置所代表的特別的形成樣式,以及所蘊(yùn)含的寒武紀(jì)碳酸鹽臺(tái)地的類型,將為更大區(qū)域的追索和對(duì)比、以及華北地臺(tái)第三世的古地理重建提供重要的線索和思考途徑。
[Abstract]:The third series of Cambrian system in North China platform, including Maozhuang formation, Xuzhuang formation, Zhangxia formation and Gushan formation, developed oolitic beach limestone in the upper part of the platform. Therefore, the concept of "platform marginal granular beach facies" in Wilson carbonate facies zone is not conformed to the standard. In the Xiweidian section of the western suburb of Beijing, sequence stratigraphy based on sedimentary facies sequence shows that these oolitic beach facies strata often form late high water level system tracts or forced regressive system tracts of sequences. The formation pattern of oolitic beach under sequence stratigraphic framework is shown to be the sedimentary response of slow decline of relative sea level in the context of relatively rapid subsidence, which does not conform to the standard sequence stratigraphic model. Because in the standard sequence stratigraphic model sedimentation mainly occurs at the stage of relative sea level rise and stagnation and a continuous erosive unconformity surface will be formed during the sea level fall. Furthermore, it corresponds to the continental shelf facies calcareous mudstone and deep gentle slope facies banded marl limestone during transgression, as well as shallow-sea shelf type platform, which is dominated by muddy carbonate sediments. The large-scale oolitic beach developed during the process of forced regression represents a new type of carbonate platform among the various types of carbonate platform in the Cambrian. That is, a special carbonate platform characterized by the oolitic sand dominated by the shallow sea carbonate shelf, that is, the shallow sea shelf is covered by a large area of granular oolitic sediments, with a gentle slope on one side of the sea and a tidal flat on one side of the land. Therefore, the Cambrian third Series, the sequence stratigraphic location of the oolitic beach, and the type of Cambrian carbonate platform contained in the lower Weidian section of the western suburb of Beijing will be the pursuit and correlation of a larger area. The paleogeographic reconstruction of the third North China platform provides important clues and ways of thinking.
【作者單位】： 中國(guó)石油化工集團(tuán);中國(guó)地質(zhì)大學(xué)地球科學(xué)與資源學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41472090、40472065、49802012)資助
【分類號(hào)】：P534.41;P539.2

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