巴基斯坦少新世有孔虫生物地层学

IF 1.6 3区地球科学 Q2 GEOLOGY

Rivista Italiana Di Paleontologia E Stratigrafia Pub Date : 2020-05-08 DOI:10.54103/2039-4942/13430

A. A. Kureshy

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引用次数: 1

摘要

巴基斯坦的海相渐新世矿床出露于俾路支斯坦盆地和下印度河盆地。俾路支斯坦盆地的沉积物属于马克兰组霍贾克地层。它们代表了三个浮游有孔虫区，即 Globigerina ampliapertura 区、G. ciperoensis 区和 Globorotalia kugleri 区，分别对应早、中、晚渐新世。信德的下印度河盆地沉积包括 Kirthar 和 Nari 地层。根据较大的有孔虫，这些沉积可分为 Nummulites fichteli 区（渐新世早期）、N. fichteli/Lepidocyclina (E.) dilatata 区（渐新世中期）和 L. dilatata 区（渐新世晚期）。由于始新世末期的造山运动一直持续到渐新世，上印度河盆地没有渐新世沉积。

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THE OLIGOCENE FORAMINIFERAL BIOSTRATIGRAPHY OF PAKISTAN

The marine Oligocene deposits of Pakistan are exposed in the Baluchistan and Lower Indus Basins. The Baluchistan Basin deposits are referred to the Khojak Formation of Makran Group. They represent three planktic foraminiferal zones, the Globigerina ampliapertura Zone, G. ciperoensis Zone and Globorotalia kugleri Zone, corresponding to Early, Middle and Late Oligocene. The Lower Indus Basin deposits of Sind include the Kirthar and Nari Formations. On the basis of the larger Foraminifera these deposits are divided into Nummulites fichteli Zone (Early Oligocene), N. fichteli/Lepidocyclina (E.) dilatata Zone (Mid. Oligocene), and L. dilatata Zone (Late Oligocene). The Oligocene deposits are absent in the Upper Indus Basin due to the orogenic movement which took place at the end of the Eocene and continued in the Oligocene.

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来源期刊

Rivista Italiana Di Paleontologia E Stratigrafia 地学-地质学

CiteScore

3.60

自引率

4.30%

发文量

审稿时长

>12 weeks

期刊介绍： The Rivista Italiana di Paleontologia e Stratigrafia was founded in 1895. It publishes original papers dealing with all fields of paleontology and of stratigraphy, from Italy and the Mediterranean to the Tethys, as well across the globe from China to North America.