Melanite from Kuroiwa, Kakizaki-cho, Niigata Prefecture, Japan
		Geology and planktonic foraminiferal biostratigraphy of the Paleocene-Eocene succession of the Zinda Pir section, Sulaiman Range, Southern Indus Basin, Pakistan
		Abstracts for Geological Survey Seminar, no. 253

Melanite from Kuroiwa, Kakizaki-cho, Niigata Prefecture, Japan

Yasuyuki Banno, Yasuhiro Kosuge and Tsuyoshi Ito

1997

vol. 48 (11), p. 591-594, 3 figs., 3 tables.

Keywords: melanite, titanium, Kuroiwa, Niigata Prefecture, Japan.

Abstract: Melanite (up to 3.8 wt.% TiO₂) is found in druses in pyroxene andesite from Kuroiwa, Kakizaki-cho, Niigata Prefecture, Japan. The associated minerals are diopside, wollastonite, grandite (TiO₂< 1.0 wt.%), scolecite, thomsonite, datolite and galena. Melanite is euhedral in form (up to 1.5 mm), and is overgrown by andradite (TiO₂< 0.7 wt.%). The deficiency of Si (2.78-2.91 per formula unit for O=12) suggests Ti⁴⁺(VI)+(Fe³⁺, Al)(IV)＝(Fe³⁺,Al)(VI) + Si(IV) substitution. The unit cell parameter is a=12.018(9)Å.

Geology and planktonic foraminiferal biostratigraphy of the Paleocene-Eocene succession of the Zinda Pir section, Sulaiman Range, Southern Indus Basin, Pakistan

Muhammad Yousaf Warrich and Hiroo Natori

1997

vol. 48 (11), p. 595-615, 6 figs., 6 tables., 15 plates.

Keywords: lithostratigraphy, Paleocene, Eocene, planktonic foraminifera, biostratigraphy, Indus Basin, Pakistan

Abstract: Exposed section along the Sori Nadi, a river which runs across the Zinda Pir area, eastern part of the Sulaiman Range, Southern Indus Basin, Pakistan, is a relatively continuous Middle Paleocene to Late Eocene shallow to deep marine sedimentary sequence. The sequence consists of three formations: Dunghan, Ghazij, and Kirthar Formations in ascending order. Detailed geological mapping of the western limb of the Zinda Pir Anticline along the Sori Nadi was carried out. The section was also measured to know the lithlogical variations and the thickness of the individual formations. Moreover, a total of seventy samples were systematically collected in the field for the purpose of establishing the planktonic foraminiferal biostratigraphy.
　Abundant and well preserved planktonic foraminifers were recovered from the Dunghan Formation, the lowermost part of the Ghazij Formation, and the upper part of the Kirthar Formation. The upper part of the Ghazij Formation and the lower part of Kirthar Formation, however, contain little and poorly preserved planktonic foraminifera. A total of seventy-seven species and subspecies belonging to fourteen genera were identified. Subsequently, nine biostratigraphic zones were established based on occurrence of representative species: Morozovella angulata Interval Zone, Planorotalites pseudomenardii Partial-Range Zone, Morozovella velascoensis Interval Zone, Morozovella subbotinae Interval Zone, Morozovella formosa formosa Interval Zone, Morozovella aragonensis Interval Zone, Morozovella spinulosa / Truncoroloides topilensis Total-Range Zone, Catapsydrax howei Interval Zone and Globigerina officinalis Interval Zone in ascending order.
　Based on the established planktonic foraminiferal zones, the Dunghan Formation is assigned to Middle Paleocene through Early Eocene age while the lower part of the Ghazij Formation is assigned to the Early Eocene. The Pir Koh Ls & Marl Member of the Kirhtar Formation is assigned to the Middle Eocene whereas the Drazinda Member is assigned to a late Middle Eocene through early Late Eocene age.

Abstracts for Geological Survey Seminar, no. 253 -Inauguration of Earthquake Research Department and future earthquake research at GSJ-

1997

vol. 48 (11), p. 631-643