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早白垩世泥炭地净初级生产力及其控制因素——来自二连盆地吉尔嘎郎图凹陷6号煤的证据
  • ISSN号:1000-0550
  • 期刊名称:《沉积学报》
  • 时间:0
  • 分类:P618.117[天文地球—矿床学;天文地球—地质学]
  • 作者机构:[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083, [2]英国诺丁汉大学工程学院,NG72RD, [3]中国石油勘探开发研究院廊坊分院,河北廊坊065007
  • 相关基金:国家自然科学基金重点项目(41572090); 国家科技重大专项(2016ZX05041004-003)
中文摘要:

现代泥炭地中蕴藏着巨量的碳,泥炭地生产力的高低会影响全球碳循环及全球气候变化。前人对全新世以来泥炭地生产力做了大量研究,但对前第四纪的"深时"阶段的泥炭地生产力则极少涉及,其主要原因是缺少精确的定年方法。以二连盆地吉尔嘎郎图凹陷早白垩世6号煤为例,利用地球物理测井信号进行频谱分析并获得煤层中米兰科维奇旋回周期参数(123 ka(偏心率):38.1 ka(斜率):22.1 ka(岁差)),将米兰科维奇旋回作为"深时"地层时间的"度量"工具,计算出6号煤层碳的聚集速率为35.1~38.9 gC/(m~2·a),进一步推算出其所代表的泥炭地的碳聚集速率为46.2~51.2 gC/(m~2·a),净初级生产力(NPP)为231~256 gC/(m~2·a)。将该计算结果与全新世同一纬度带泥炭地生产力水平比较,并结合前人研究成果综合分析影响因素,得出早白垩世泥炭地生产力水平主要受温度和大气中二氧化碳含量控制,而这两种因素又与气候相关联,则泥炭地生产力的研究可能对进一步了解古气候提供帮助。

英文摘要:

Peatlands contain a huge amount of carbon whose productivity will affect the global carbon cycle and even climate change. A number of productivity researches have been done on the Holocene peats,but few is dealing with the pre-quaternary due to a lack of precise dating method. In this paper,the geophysical logging signals were used to analyze the Milankovitch orbital cycles which were further used as a tool to date the "deep time"and to measure the carbon accumulation rates of the paleo-peatlands. The spectrum analysis has been conducted on the geophysical logging signals of a thick coal( No.6 seam) of the Early Cretaceous in the Jiergalangtu sag of the Erlian Basin,and the Milankovitch cycle parameters of 123 ka( eccentricity) : 38.1 ka( slope) : 22.1 ka( precession) have been obtained for this coal. These Milankovitch cycles were used as "measurement"to calculate the carbon accumulation rate and the net primary productivity( NPP) based on the carbon contents and coal rank of coal. The No.6 coal had a carbon accumulation rate of 35.1 ~ 38.9 g C /( m~2·a) which corresponds to the carbon accumulation rate of 46.2~51.2 gC /( m~2·a) and the net primary productivity( NPP) of 231~256 gC /( m~2·a) for the Early Cretaceous peatlands. A comprehensive comparison with the productivity levels of the Holocene peatlands( NPP) of 150 ~ 250 gC /( m~2·a)in the same latitude confirmed that the productivity level in the Early Cretaceous peatlands were controlled by paleotemperature and concentration of carbon dioxide in the atmosphere. As the paleotemperature and concentration of carbon dioxide were closely related to the paleoclimates,these productivity values of the paleo-peatland would help us understand more about paleoclimates of "deep time".

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期刊信息
  • 《沉积学报》
  • 北大核心期刊(2011版)
  • 主管单位:
  • 主办单位:中国科学院兰州地质研究所 中国矿物岩石地球化学学会沉积学专业委员会 中国地质学会沉积地质专业委员会
  • 主编:刘宝珺
  • 地址:兰州市东岗西路382号
  • 邮编:730000
  • 邮箱:cjxb@ns.lzb.ac.cn
  • 电话:0931-4960916
  • 国际标准刊号:ISSN:1000-0550
  • 国内统一刊号:ISSN:62-1038/P
  • 邮发代号:54-45
  • 获奖情况:
  • 国内外数据库收录:
  • 美国化学文摘(网络版),美国地质文献预评数据库,英国动物学记录,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),中国北大核心期刊(2000版)
  • 被引量:24598