Deposition of calcium carbonate into postglacial reefs: a test on a "coral reef hypothesis"

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Other Title
  • 後氷期のサンゴ礁への炭酸カルシウム堆積速度
  • コウヒョウキ ノ サンゴショウ エ ノ タンサン カルシウム タイセキ ソクド

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Description

Calcium carbonate deposition in the ocean results in a release of CO2 to the atmosphere. Based on this process, a "coral reef hypothesis" was proposed to explain postglacial CO2 increase as a result of reef growth. The model assumed that if twice the mass of atmospheric carbon (2 ACM) were deposited into coral reefs between 15,000 and 10,000 years B. P., the accompanying release of CO2 would account for 40 ppm increase of the atmospheric CO2. In this paper, calcium carbonate deposition rates into postglacial reefs with a time scale of 1000 years is calculated based on shallow core researches to test the hypothesis. The total reef mass is estimated to be 2 ACM. Calcium carbonate deposition rates of postglacial reefs attained their maximum between 5000 and 6000 years B. P. with a rate of 0.45 ACM for 1000 years. This major deposition phase does not match the period of observed CO2 increase in the atmosphere. This discrepancy is not in agreement with the "coral reef hypothesis" .

Journal

  • Chikyukagaku

    Chikyukagaku 27 (1), 37-42, 1993

    The Geochemical Society of Japan

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