Geochemical characterization of an organic-rich carbonate from the Grosmont Formation, Alberta, Canada

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• 作者：Junghwan Seol ; Youngwoo Kil ; Ji-Hoon Kim ; Jiyoung Choi ; Il-Mo Kang
• 关键词：Grosmont Formation ; organic ; rich carbonate ; dolomite ; geochemical analyses ; isotopic ratio
• 刊名：Geosciences Journal
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：19
• 期：2
• 页码：205-217
• 全文大小：766 KB
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• 作者单位：Junghwan Seol (1)
  Youngwoo Kil (1)
  Ji-Hoon Kim (2)
  Jiyoung Choi (2)
  Il-Mo Kang (3)
  
  1. Department of Energy and Resources Engineering, Chonnam National University, Gwangju, 500-757, Republic of Korea
  2. Petroleum and Marine Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Republic of Korea
  3. Mineral Resources Research Division, Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, Republic of Korea
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geosciences
  
• 出版者：The Geological Society of Korea, co-published with Springer
• ISSN：1598-7477

文摘

The Grosmont Formation is a massive, organic-rich carbonate deposit that subdivides into upper (UG) and lower (LG) units. Geochemical analyses of Grosmont carbonate rocks collected from wells 10-12-93-24W4 and 11-33-94-22W4 allowed us to differentiate the depositional and diagenetic conditions for these two units. The UG unit subdivides into three subunits (UG1–UG3) and consists of fine- to coarse-crystalline and subhedral dolomite. The LG unit consists of dolomitic limestone and calcareous dolostone with medium- to coarse-crystalline, euhedral to subhedral dolomite and calcite. These units also include small amounts of quartz, illite, pyrite, K-feldspar and other trace minerals. Petrographic and geochemical analyses indicate that the LG unit formed under influence of clastic sediment input. Isotopic ratios for UG dolomites suggest precipitation within a near surface environment under evaporitic/ hypersaline conditions. By contrast, the LG dolomite may have formed in a diagenetic environment at salinities lower than those inferred for UG samples, according to observed isotopic ratios. Both UG and LG carbonates exhibit 87Sr/86Sr ratios (0.7082 to 0.7086) and δ18O values (?.03 to ?.09-PDB) that are consistent with formation from Devonian seawater at temperatures ranging from 44 °C to 57 °C.