臺灣中新世石底層煤中硫及微量元素含量之沉積涵義; Depositional implications of Sulfur and trace element contents in Shihti coal

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Title:	臺灣中新世石底層煤中硫及微量元素含量之沉積涵義;Depositional implications of Sulfur and trace element contents in Shihti coal
Authors:	陳佳芬;Chia-Fen Chen
Contributors:	應用地質研究所
Keywords:	硫;微量元素;沉積環境;Sulfur;trace element;depositional environment
Date:	2001-06-22
Issue Date:	2009-09-22 09:58:02 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	過去台灣對於煤的古沈積環境都是由沈積學的觀點來探討，並沒有真正從煤的角度去分析。煤中C、H、O、N元素的來源皆是植物體生長時就已具備，等死亡後便轉變到煤層中沈澱，除了以上的元素之外，煤中的成份還有硫及微量元素，這兩項成份的種類及含量多寡則是隨著沈積環境的不同而有所差異，也因為如此，若對煤中的硫份及各種微量元素能充分了解，應能幫助我們了解古沈積環境。本研究針對台灣煤層開採中的石底層取了四個樣品做微量元素分析，採樣點分別位在台北縣三峽、新店地區的利豐、裕峰、安順、五坑煤礦場。分析的項目包括：硫份、微量元素、黃鐵礦體積百分比、鏡煤素反射率量測等。希望經由以上的分析能對台灣石底層的成煤環境有更深入的探討。根據實驗分析的結果，本研究對測區石底層煤做了以下結論：石底層沈積時的位置是濱海相，受到海水經常性覆蓋，以致於在泥煤沈積時有許多黃鐵礦的形成，也由於硫化鐵的含量高及海水的供應，使得煤層中的B、As、Tl元素富集。微量元素指標分析結果，以四個煤礦作討論，古沈積環境分為兩種類型：第一種為潟湖或偶有海水淹沒的沼澤，主要的煤礦有安順、裕峰、利豐；第二種位置比第一種靠近海邊，五坑為較常受到海水影響的濱海三角洲，且推測在石底層層序中為上層或最上層。 The distribution of sulfur and trace element in coal is controlled by the depositional environment of peat. Four high volatile bituminous coal samples were collected from the Shihti Formation, northern Taiwan. Their sulfur and trace element contents were analyzed according to ASTM procedures. The analytic results indicate a reductive, littoral to brackish environment. The high pyrite contents can lead to the enrichment of B, As, Tl, with enrichment factors reaching 100. The depositional environment of Lifeng, Yufeng, and Anshuen mines were concluded as a lagoon or swamp, whereas the Wukeng mine was believed to be a delta.
Appears in Collections:	[Graduate Institute of Applied Geology] Electronic Thesis & Dissertation

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