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BAB V
KESIMPULAN DAN SARAN
5.1
Kesimpulan Hasil kajian tentang biomarka asam fraksi monoester sedimen laut Arafura
MD.05-2967 pada kedalaman sedimen 900 cm menunjukkan adanya kontribusi organisme laut berupa bakteri dan plankton pada sedimen. Hasil kajian tentang biomarka sedimen laut Arafura MD.05-2967 pada kedalaman sedimen 2100 cm mengantarkan pada kesimpulan-kesimpulan sebagai berikut : 1.
Distribusi n-alkana pada sedimen laut Arafura berada pada rentang C15-C35 yang mana C31 merupakan n-alkana dengan kelimpahan tertinggi dan didominasi oleh n-alkana dengan jumlah rantai karbon ganjil. Distribusi n-alkana tersebut menunjukkan adanya bahan organik yang berasal dari alga dan bakteri laut serta tanaman tingkat tinggi yang berasal dari daratan. Kontribusi bahan organik yang berasal dari daratan dan perairan air tawar ditunjukkan pula dengan adanya homolog metil-n-keton pada rentang C15-C27.
2.
Periode pengendapan sedimen kurang lebih terjadi pada masa Pleistosen.
3.
Kontribusi bakteri pada sedimen ditunjukkan oleh adanya biomarka 22,29,30trisnorhop-13(18)-ena, isomer isomer 17β(H), 21β(H) dan 17α(H), 21β(H), fern-8-ena, 7-metil-3-etil-1,2-siklopenteno-krisen dan hopanoid keton.
4.
Perilen menunjukkan kondisi lingkungan pengendapan yang cenderung bersifat anoksik. Kelimpahan n-alkana C22 yang tinggi menunjukkan lingkungan
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pengendapan bersifat hipersalin dan lingkungan deposisional zona fotik pada kolom air terindikasi dengan adanya 2,3,6-trimetilarilisoprenoid. 6.
Profil biomarka asam menunjukkan adanya kontribusi organisme laut berupa bakteri dan plankton pada sedimen.
5.2.
Saran Informasi mengenai lingkungan purba sedimen yang tercakup pada penelitian
ini, bisa digali lebih lanjut dengan pengkajian biomarka lainnya yang terkandung dalam sedimen laut Arafura MD.05-2967, B-900 berupa fraksi hidrokarbon alifatik, keton dan aromatik.
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