| 陆相二叠一三叠系界线划分和事件 |
| |
| 引用本文： | 杨基端,曲立范,周惠琴,程政武,周统顺,侯静鹏,李佩贤,孙素英.陆相二叠一三叠系界线划分和事件[J].现代地质,1988(3). |
| |
| 作者姓名： | 杨基端 曲立范 周惠琴 程政武 周统顺 侯静鹏 李佩贤 孙素英 |
| |
| 作者单位： | 中国地质科学院地质研究所
(杨基端，曲立范，周惠琴，程政武，周统顺，侯静鹏，李佩贤)，中国地质科学院地质研究所(孙素英) |
| |
| 摘 要： | 我国陆相二叠—三叠系界线的划分主要依据古脊椎动物,孢粉,双壳类、介形虫和古植物等.这些化石组合特征在界线附近都有明显的变化.这种变化不仅可以用来划分界线,而且结合在界线附近其它非生物(沉积物的粒度和颜色等)的异常变化,可以看出在二叠—三叠纪之交曾发生过某种事件.
|
| 关 键 词： | 陆相 二叠一三叠系界线 事件 |
CONTINENTAL PERMIAN-TRIASSIC BOUNDARY AND EVENT |
| |
| Yang Jiduan,Qu Lifan,Zhou HuiqinCheng Zhengwu,Zhou Tongshun,Hou JingpengLi Peixian,Sun Suying.CONTINENTAL PERMIAN-TRIASSIC BOUNDARY AND EVENT[J].Geoscience——Journal of Graduate School,China University of Geosciences,1988(3). |
| |
| Authors: | Yang Jiduan Qu Lifan Zhou HuiqinCheng Zhengwu Zhou Tongshun Hou JingpengLi Peixian Sun Suying |
| |
| Abstract: | Much progress has been made in recent years concerning the continent-al Permian-Triassic boundary shown by both biotic and non-biotic anomali-es. Biotic changes near the P/T boundary are mainly concerned with such groups as paleovertebrates, fossil plants, sporopollen, conchostracans and bi-valves.
In Northwest China the Dicynodont fauna of Late Permian was replaced by the Lystrosaurus fauna of Early Triassic with the exception of single sp-
ecies like D. sinkiangensis mixed with the Lysttosaurs. In North China a mi-
xed Permian Pareiasaurs and Dicynodonts was focahy succeeded by Lyst-
rosaurs.
Among sporopollen assemblages in late Permian,Gymnospermous (incl-
uding pteripterspermous) pollen prevailed,but in Earliest Triassic pteriphy-
tic spores dominated. Besides, archaic pollen which flourished in Late Per-
mian became partially extinct and partially decreasing in Early Triassic,
with appearance of new. elements. Fossil plants,conchostracans and bivalves
also show significant changes at the P/T boundary. All these changes may
help determine this boundary.
As to non-biotic changes near the P/T boundary it is worth noting that
from the Permian to the Triassic the grain-size of sediments was in-
creasing,the color of sediments changed from chiefly yellow-greyish green
with purplish red to mainly red or purple, the water-depth was decreasing
and the climate was turning drier and hotter.In short,both biotic and non-
biotic allomalies observed near the P/T boundary indicate that some events
must have happened. |
| |
| Keywords: | : continental facies Permian-Triaassic boundary event |
| 本文献已被 CNKI 等数据库收录！ |
|
