Ha Tien Fm

Period:

Permian

Age Interval:

Early and Middle Permian P_1-2 (ht), (28, 29)

Province:
West Nam Bo

Type Locality and Naming

Nui Com section at Ha Tien, Kien Giang Province (E = 10°16’; E = 104°35'). When Nguycn Xuan Bao (1978) described the Ha Tien Fm the stratotype was not indicated, so the Nui Com scction is proposed here as the lectostratotype.

Synonym: Hệ tầng Hà Tiên: Nguyễn Xuân Bao 1978 (Permi); Lê Hùng in Vũ Khúc et al. 1984 Pcrmi hạ - thượng; Vũ Khúc, Bùi Phú Mỹ et al. 1990 (Permi); Nguyễn Ngọc Hoa et al. 1991 (Permi); Nguyền Xuân Bao 1994 (Permi: Artinski - Guadalup); Nguyễn Xuân Bao, Vũ Như I lùng 2000. Les calcaires de Ha Tiên (Núi Trầu, núi Xa - Ngach, nui Lò Vôi, núi 93): Lê Thị Viên 1959 (Permien). Loạt Bắc Sơn (part): Nguyền Văn Liêm 1979.

Carbonalolit, Bắc Son trung - phần trên: Nguyễn Văn Licm 1985 (Permi). Hệ tầng Hòn Chông (part): Nguyễn Xuân Bao et al. 1994. Hệ tẩng Chùa Hang: Trương Công Đượng et al. 1998

[Figure: Hà Tiên Fm: Limestone of Hà Tiên Fm - Phụ Tử Island (images courtesy of Prof. Ta Hoa Phuong, Vietnam Natl. Univ. Hanoi)]

Lithology and Thickness

Limestone: 1. Dark grey, fine-grained, medium-bedded limestone 30 - 40 m thick. 2. Dark grey, light grey, thick-bedded limestone 80 -90 m thick. The total thickness of the section is 110 - 120 m,

Lithology Pattern:

Limestone

Relationships and Distribution

Lower contact

Regionally, the next older unit is the Devonian Hon Heo Fm.

Upper contact

The Ha Tien Fm has a tectonic contact with the Dat Do Fm (late Permian) or other formations in its distribution area.

Regional extent

Kien Giang and Gulf of Thailand. The formation extends for 30km along the coastal zone from the Cambodian frontier to Hon Chong Cape, and is exposed in the small limestone hills 100 m high. Marl occurring at Hon Chong (Ha Tien area) is a variation of the upper part of the Ha Tien Fm, and has been described as the Chua Hang Marl Member.

GeoJSON

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Fossils

Contains abundant foraminifera Pseudofusulina margheritti, Parafusulina gigantea, Chusenella crassa padangensis, Ch. tingi, Verbeekina nuicomensis, V. verbeeki, Pseudodoliolina pseudolepida, Neoschwagerina toriyamai, N. margariiae, N. douvillei, Afghanella sumatrinaeformis, Sumatrina annae, corals Parawentzella regularis, Multimurinus homanhtrungi, M. comensis (Fontaine H. 1961, 1967), and algae Mizzia velebitana, Anthraporella spectabilừ, Gymnocodium grandis v.v...

Age

Early to Middle Permian based on fossils.

Age Span:

Beginning stage:

Asselian

Fraction up in beginning stage:

0.0

Beginning date (Ma):

298.89

Ending stage:

Wordian

Fraction up in the ending stage:

1.0

Ending date (Ma):

264.34

Depositional setting

Depositional pattern:

Additional Information

Compiler:

Tran Van Tri and Vu Khuc (Editors; Geology and Earth Resources of Viet Nam, General Dept. of Geology and Minerals of Viet Nam; completed in Dec., 2011), with additional details from Tong-Dzuy Thanh and Vu Khuc (Editors; Stratigraphic Units of Viet Nam, 2^nd edition; 2011; English edited by A. Boucot).