在太平洋中部白垩纪-第三纪边界以及其他灭绝和撞击层沉积物中寻找全球野火产生的烟尘。

A search for soot from global wildfires in central Pacific Cretaceous-Tertiary boundary and other extinction and impact horizon sediments.

作者信息

Wolbach Wendy S, Widicus Susanna, Kyte Frank T

机构信息

Department of Chemistry, DePaul University, Chicago, Illinois, USA.

出版信息

Astrobiology. 2003 Spring;3(1):91-7. doi: 10.1089/153110703321632444.

DOI:10.1089/153110703321632444

PMID:12804367

Abstract

Hypotheses of global wildfires following the Cretaceous-Tertiary (KT) boundary impact are supported by high concentrations of elemental carbon (3.6 mg cm(-2)) and soot (1.8 mg cm(-2)) in DSDP Site 465, which was located several thousand kilometers from potential continental sources at 65 Ma. Soot is not preserved at four other central Pacific KT localities, but this is attributed to loss during oxic diagenesis. We find no evidence for wildfires related to major impacts in the late Eocene or to Ir anomalies and extinctions in the late Cenomanian.

摘要

白垩纪-第三纪（KT）界线撞击后全球野火的假说得到了深海钻探计划（DSDP）465站点中高浓度元素碳（3.6毫克/平方厘米）和烟灰（1.8毫克/平方厘米）的支持，该站点在6500万年前位于距潜在大陆源数千公里处。在其他四个中太平洋KT地点，烟灰没有保存下来，但这归因于有氧成岩作用期间的损失。我们没有发现与始新世晚期重大撞击或晚森诺曼期铱异常和物种灭绝相关的野火证据。