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題名 | Mineralogical Properties and Origins of the Glauconitic and the Chloritic Peloids from Kuohsing Area, Central Taiwan=臺灣中部國姓地區海綠石質丸與綠泥石質丸之礦物學性質與成因 |
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作者姓名(中文) | 林泗濱; 林政德; | 書刊名 | 中國地質學會會刊 |
卷期 | 36:3 1993.07[民82.07] |
頁次 | 頁223-243 |
分類號 | 356.232 |
關鍵詞 | 中部; 海綠石質丸; 國姓地區; 綠泥石質丸; 臺灣; 礦物學; |
語文 | 英文(English) |
中文摘要 | 臺灣中部國姓地區之漸新世至中新世海相沈積地層中產有海 綠石質丸及綠泥石質丸。該等丸粒呈暗綠色至褐黑色,常較局部 集中於幾個薄岩層(所占體積可達約40%),而再被夾於上述之 海相地層中。 這些丸粒主要由富於鐵質的數種粘土礦物,依各種不同比例 而組成,即海綠石、鐵鎂綠泥石、鐵膨潤石,以及它們之間的混 層礦物,另外伴有黃鐵礦、鐵白雲石或菱鐵礦。不過每一個地層 所產出之丸粒仍然具有其不同的礦物學特性,所以它們是有助於 該地區之地層對比。此等丸粒依其礦物及化學組成可分為四類: (1)富鐵伊來石質丸粒(或伊來石質海綠石丸粒);(2)富鐵海綠石 丸粒;(3)貧鐵海綠石丸粒;及(4)富鐵綠泥石丸粒。前三類主要 產於較遠濱之外大陸棚上之沈積物中,而第四類則主要產於較臨 濱之內大陸棚上。 本區此等丸粒之形態成因,最主要的就是生物排泄物丸粒之 轉化,其次為粘土粒級或膠體粒級物質之團聚及化石碎屑中之內 填物之轉變而成。只有極少數丸粒由其他碎屑性沈積顆粒轉變而 成。本研究使吾人相信海綠石礦物化作用,無須只限於甘一特別 之原始前驅物質,只是碎屑性的,粘土粒級的退化層狀構造矽酸 鹽礦物顆粒可能是其最通常的前驅物質;同時該作用也無須只限 於某一特別的大環境,而只須有鐵、鉀之充份供應及具過當的氧 化--還原能力的微環境即可。 |
英文摘要 | The glauconitic and the chloritic peloids from the Kuohsing area, central Taiwan were mineralogically studied. Such peloids occur as dark greenish to brownish dark grains relatively concentrated with their content about 5% to 40% in volume, in a number of thin strata intercalated in the marine sedimentary sequence ranging from Oligocene to Miocene. Although these peloids are mainly composed of iron-rich clay minerals in various proportions, namely glauconite, Mg-Fe chlorite, nontronite and their mixed-layer minerals accompanied by pyrite or ankerite or siderite, the peloids formed in each stratigraphic unit have their rather consistently different mineral composition and properties, so that they are helpful to the local stratigraphic correlation. These peloids can be classified into four categories according to their mineralogical properties and chemical compositions: namely, (1)the Fe-rich illite peloid (or the illitic-glauconite peloid), (2)the Fe-rich glauconite peloid, (3)the Fe-poor glauconite peloid, and (4)the Fe-rich chlorite peloid. The former three categories mainly occur in the sediments of lower off-shore or outer-shelf, while the fourther one occurs in the sediments of near-shore or inner-shelf. The commonest origin of the morphology of peloids studied is the conversion of faecal pellets; the next most common is the agglomeration of clay-or colloidal-sized materials and the alternation of internal filling in fossil debris. Only a few are pseudomorph after detrital fragments. This study leads us to believe that no particular starting precursory material is required for glauconitization but the detrital, clay-sized, degraded layer silicate particles appear to be the most common ones; no particular macroenvironment is required, as long as the sufficient supply of Fe, K and a micro-environment with a suitable redox potential are available. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。