ゴルダ山脈の堆積物中の多金属硫化物と関連した石油
Science (New York, N.Y.)
|December 5, 1986
まとめ
エスカナバ渓谷の石油は,陸上の有機物質から生まれた. ゴルダ・リッジの熱水活動が,その形成と多金属硫化物鉱化を促進した.
科学分野:
- 地質化学 地質化学
- 海洋地質学 海洋地質学
- 石油科学 石油科学とは
背景:
- カリフォルニア州北部沖のゴルダ山脈の南部に位置するエスカナバ渓谷には,アスファルト石油とポリメタリック硫化物で豊富な堆積物サンプルが含まれています.
- この石油と関連する鉱物化の起源と形成プロセスを理解することは,地域の地質学および地化学的評価に不可欠です.
研究 の 目的:
- エスカナバ渓谷の堆積物サンプルで見つかったアスファルト性石油の起源を決定するために.
- ゴルダ・リッジ地域における石油と硫化物鉱物化の形成における熱水活動の役割を調査する.
主な方法:
- 石油サンプル内の炭化水素の分子分布の分析.
- 堆積物の組成と鉱物学の地化学的評価.
主要な成果:
- 炭化水素の分子分布は,石油が陸上の有機物質から得られたことを示している.
- 石油は,エスカナバ・トローの内部にあるタービドイトの堆積物と関連しています.
- ゴルダ・リッジの拡散センターの水熱活動が,石油形成の熱源として特定されました.
- 熱水流体も,ポリメタリック硫化物の鉱化源として特定されました.
結論:
- エスカナバ・トローのアスファルティック・ペトロイムは,土壌の有機物質から,土砂岩の堆積物の中に由来する.
- ゴルダ山脈の水熱処理は,この地域の石油生成とポリメタリック硫化物形成の両方と直接関連しています.
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