Original paper
High-resolution integrated stratigraphy of Upper Ordovician to lower Silurian strata: applications to black shale drill cores in South China
Sun, Zongyuan; Melchin, Michael J.; Štorch, Petr; Chen, Qing; Zhao, Fangqi; Fan, Junxuan
Newsletters on Stratigraphy Volume 57 Number 4 (2024), p. 445 - 474
59 references
published: Dec 10, 2024
published online: Oct 15, 2024
manuscript accepted: Aug 2, 2024
manuscript revision received: Jul 29, 2024
manuscript revision requested: Nov 6, 2023
manuscript received: Sep 6, 2022
ArtNo. ESP026005704003, Price: 29.00 €
Abstract
This paper presents an integrated stratigraphy of the Upper Ordovician to lower Silurian strata from the Yangtze platform, focusing on detailed graptolite biostratigraphy and δ13Corg chemostratigraphy of a continuous drill core section. We establish ten graptolite biozones within the Wufeng and Lungmachi formations and identify the LKCIE (Late Katian Carbon Isotope Excursion), HICE (Hirnantian Isotope Carbon Excursion), and EACIE (Early Aeronian Carbon Isotope Excursion) in the δ13Corg curve. Through the identification of four positive carbon isotope excursions, including the LACIE (Late Aeronian Carbon Isotope Excursion), this paper addresses and clarifies the substantial uncertainties in biozonal boundaries identified in previous research, providing a definitive integrated stratigraphy framework, and significantly enhances both regional and global stratigraphic correlation. Our approach revises biozone boundaries within drill cores and outcrop sections in South China, revealing abrupt turning points in depositional rate changes within the Lungmachi Formation, linked to the Kwangsian Orogeny and global sea-level fluctuations. This high-resolution stratigraphic framework contributes to biostratigraphy and chemostratigraphy and aids in efficient hydrocarbon exploration.
Keywords
Wufeng and Lungmachi formations • carbon isotope excursions • graptolite biostratigraphy • integrated stratigraphy • drill core