地质学报（英文版）2008，Vol.82Issue(2)：392-398,7.
Petrologic and REE Geochemical Characters of Burnt Rocks
Petrologic and REE Geochemical Characters of Burnt Rocks
摘要
Abstract
The study of burnt rocks is beneficial to the discussion on the tectonic movement,paleoclimate and paleogeography that coal seams are subjected to after they were formed. In order to obtain the basic data on the features of the burnt rocks, a systematic study of petrology and REE geochemistry on burnt rocks in Shenmu, Northern Shaanxi Province has been done, using the methods of SEM, EDS, susceptibility measurements and ICP-MS. The burnt rocks are divided into two series in the section: the melted rocks and the baked rocks. SEM and EDS analyses reveal that all the minerals show burnt and melted traces, and there are no clay minerals except iliite found in the burnt rocks. Susceptibility measurements reveal that the burnt rocks have abnormally high susceptibility values,whereas a geochemical analysis shows that the REE distribution pattern of burnt rocks is similar to that of sedimentary rocks (initial rocks). In the longitudinal section, with increasing degree of burning (from baked rocks to melted rocks), the ΣREE gradually decreases, and the total REE of melted rocks is obviously lower than that of baked rocks. Besides, the melted rocks show apparent negative Ce anomalies, while the baked rocks show no anomaly of Ce, and sometimes even show positive anomalies.关键词
burnt rock, mineral petrology, susceptibility, REE, negative Ce anomalyKey words
burnt rock, mineral petrology, susceptibility, REE, negative Ce anomaly分类
天文与地球科学引用本文复制引用
HUANG Lei,LIU Chiyang,YANG Lei,ZHAO Junfeng,FANG Jianjun..Petrologic and REE Geochemical Characters of Burnt Rocks[J].地质学报（英文版）,2008,82(2):392-398,7.基金项目
This research was jointly supported by the National Important Basic Research Program of China (Grant No.2003CB214600), the Ministry of Education Changjiang Scholars and "Oil-Gas Basin" Innovation Team Development Program of China (Grant No. IRT0559) and the National Natural Science Foundation of China (Grant No. 40372096). （Grant No.2003CB214600）
