Geç Miyosen yaşlı Honaz (Denizli) kömürlü birimlerinin organik jeokimyasal özellikleri ve çökelme ortamı

Abstract

Bu çalışmada, Üst Miyosen’de çökelmiş olan Honaz-Kocapınar (Denizli) kömürlü birimlerinin organik petrografik ve organik jeokimyasal özelliklerini inceleyerek, paleo çökelme ortamına açıklık getirilmeye çalışılmıştır. İncelenen örneklerin toplam organik karbon miktarları % 5.51 ile 51.80 (ortalama %23.66) arasındadır. Ortalama HI ve Tmax değerleri sırasıyla, 71 mg HC/g TOC ve 410 °C’dir. Piroliz analiz sonuçlarına göre Tip III kerojen hakimdir. Örneklerin organik bileşenlerini hüminit ve liptinit grubu maseraller oluşturur. Oldukça düşük değerlerdeki hüminit/vitrinit yansıması ve Tmax değerleri ile Ts/Ts+Tm, Ts/Tm, C₃₀ Moretan/C₃₀ Hopan oranları, ββ/(αα+ββ) C₂₉ ve C₂₈ izomerleri ve 20S/(20R+20S) steran oranları olgunlaşmamış organik maddeye işaret eder. Uzun zincirli n-alkanların hakim pikler olması, karbon tercih indeksi (CPI), karasal/sucul organik madde oranı (TAR), mumsuluk derecesi ve C₂₉ Ts/(C₂₉ Ts + C₂₉ Norhopan) oranı karasal kökenli yüksek bitkilere işaret etmektedir. Piroliz analizi, maseral tayini ve biyomarker verileri ışığında Honaz-Kocapınar (Denizli) kömürlü seviyelerinin ısısal olarak olgunlaşmamış evrede olduğu, baskın olarak karasal organik madde içerdiği ve suboksik koşullarda çökeldiği belirlenmiştir.

Keywords

• Honaz (Denizli),Kömür,Maseral,Biyomarker,Depolanma ortamı

Organic geochemical characteristics and depositional environment of Late Miocene aged Honaz (Denizli) coal series

Abstract

In this study, paleo depositional environment was determined by examining the organic petrographic and organic geochemical characteristics of Upper Miocene coal series from Honaz-Kocapınar (Denizli). Total organic carbon amounts of investigated samples range from 5.51 to 51.80 wt. % (on average 23.66 wt. %). Average HI and Tmax values are respectively, 71 mg HC/g TOC and 410 °C. According to results of pyrolysis analysis, coal series contain Type III kerogen. The organic fraction of the samples is comprised of huminite and liptinite group macerals. Very low huminite/vitrinite reflection, Tmax values and Ts/Ts+Tm, Ts/Tm, C₃₀ Moretane/C₃₀ Hopane ratios, ββ/(αα+ββ) C₂₉ and C₂₈ isomers and 20S/(20R+20S) sterane ratios indicated that immature organic matter. Long-chain n-alkanes are dominant peaks and carbon preference index (CPI), terrestrial/aquatic ratio (TAR), degree of waxiness and C₂₉ Ts/(C₂₉ Ts + C₂₉ Norhopane) ratio indicates that terrestrial high plants. Pyrolysis analysis, maceral determination and biomarker data showed that Honaz-Kocapınar (Denizli) coal series in thermally immature stage, containing predominantly terrestrial organic matter and deposited sub-oxic conditions.

Keywords

• Honaz (Denizli),Coal,Maceral,Biomarker,Depositional environment

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