Diversity model of Pliocene-Pleistocene nannofossil of Kendeng Zone

International Conference on Earth Science, Mineral, and Energy

地球科学;矿业工程;能源学

Choiriah, S.U.^1 ; Prasetyadi, C.^1 ; Kapid, R.^2 ; Yudiantoro, D.F.^1

Department of Geology Engineering, UPN Veteran Yogyakarta, Indonesia^1

Department of Geology Engineering, FITB-ITB, Bandung, Indonesia^2

关键词: Calcareous nannofossils;    Diversity index;    Early pleistocene;    Early pliocene;    Middle Pleistocene;    Paleoclimate change;    research methods;    Sample preparation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/212/1/012038/pdf
DOI  :  10.1088/1755-1315/212/1/012038

来源: IOP

【 摘 要 】

Quantitative analyses of Pliocene-Pleistocene calcareous nannofossils from the Kendeng Zone, East Java have been performed on 181 samples collected from 4 river sections (Ngawi, Bojonegoro, Nganjuk and Jombang). The research method consists of field study and quantitative statistical analysis. Field study is to measure sections of the 4 selected sections. The samples taken include fine-grained rock (marl, shale) and carbonaceous. The sample preparation has been carried out using smears slide method. Quantitative analysis uses nannotex determination and diversity index. The river sections that have been selected consist of a continuous sediment sequence from Pliocene Kalibeng to Pleistocene Sonde Formation. The results of quantitative analysis indicate the following model of diversity nannofossil Kendeng Zone: (1) Bengawan Solo River section, Ngawi, has an average 46 specieses; Diversity Index (H′)=0.053, Homogeneity (E)=0.009, aged NN12-NN20 (Early Pliocene-Middle Pleistocene); (2) Kedungsumber River section, Soko Area, Distric of Temayang, Bojonegoro, has an average 26 specieses and Diversity Index (H′)=0.035; and Evennes/Homogeneity index (E)=0.006; and age NN12-NN20 (Early Pliocene-Early Pleistocene); (3) Kaliasin River section, Pinggir area, Distric of Lengkong, Nganjuk, has an average 40 specieses and Diversity Index (H′) = 0.050; and Evennes/Homogeneity index (E)=0.009 and NN12-NN20 (Early Pliocene-Early Pleistocene); (4) Kalibeng River section, Kedungringin Area,Distric ofPlandaan, Jombang hasan average 33 specieses, Diversity Index (H′)=0.043 and Evennes/Homogeneity index (E)=0.007, aged NN12-NN19 (Early Pliocene-Early Pleistocene).This nannofossil diversity model indicate that there is a paleoclimate change in Pliocene-Pleistocene of Kendeng zone; and methods applied by the present study has not been used by previous researchers.