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

Yıl 2018, Cilt: 24 Sayı: 6, 1192 - 1199, 18.12.2018

Demet Banu Koralay

Öz

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.

Anahtar Kelimeler

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

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

Öz

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.

Anahtar Kelimeler

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

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