Báo cáo thực địa Ba Vì

Geology of the Ba Vi group and Kien An – Do Son – Hai
Phong group.
A field trip report of K60 Geology student.

Members of group:

1.
2.
3.
4.

Nguyễn Thanh Hằng
Vũ Thị Thu Hà
Phan Thị Thu Hường
Nguyễn Thị Tú Chinh


Contents

∗ A. Introduction

1. Objectives
2. Natural Conditions of Ba Vi and Do Son
B. Geological formation

1. Sedimentary formations
1.1. Clastic sedimentary rocks
1.2. Bio-chemical sedimentary rocks
2. Magmatic formations
2.1. Extrusive rocks
2.2. Instrusive rocks

C. Geological Process
1. Endogenous processes
1.1. Magmatic activities
1.2. Tectonic activities (tectonism)
2. Exogenous processes
D. Geological Resources
E. Conclusions


A. Introduction
1. Objectives
* The fiel trip in Ba Vi and Do Son, Hai Phog city has lasted 7 days from 25/07/2016 to 31/07/2016.
With purpose of applying the knowledge that student has learned in the field. With the guidance of Pr. Ta
Hoa Phuong and Dr. Nguyen Van Huong , the field trip took place by a nice way.
* Main missions of the field trip:
- to know how to note field book.
- know how to indentify, distinguish geological, formation and structural element in the field.
- to know how to define outcrop location and
- to know how to use geological compass.

describe as outcrop.


2. Natural Conditions of Ba Vi and Do Son

∗

Ba Vì National Park (Vietnamese: Vườn quốc gia Ba Vì) is a national park located 48 km (30 mi) west

of Hanoi, Vietnam. The park is 7,377 ha (18,230 acres) in area, and is located in the Ba Vì
mountain range. The park has rich and diverse tropical and subtropical species of flora and fauna.

∗

Ba Vì National Park is located in Ba Vì District of Hanoi and two districts of Hoà Bình Province,
namely Lương Sơn and Kỳ Sơn. The Park is situated on a mountain range running north-east and southwest with its peak at Vua Peak of 1,296 m and Tản Viên Peak of 1,226 m and Ngọc Hoa Peak of 1,120
m.


∗

Kiến An is an urban district of Hải Phòng, the third largest city of Viet Nam. Kiến An district is
2
29.6 km in area, and is located in Hải Phòng city. (Figure 2)

∗

Hải Phòng is a coastal city located at the mouth of the Cấm River, in Vietnam's northeastern
coastal area, 120 km east of Hanoi. The Bính Bridge crosses the Cấm and connects the city with
Thuỷ Nguyên District. It has a total natural area of 152,318.49ha (2001). It borders Quảng Ninh
Province to the north, Hải Dương Province to the west, Thái Bình Province to the south, and the
Gulf of Tonkin to the east. Bạch Long Vĩ island, Cát Bà Island and the Long Châu islands,
located in the Gulf, are also administered as part of the city. The city is located in a convenient
position for transportation to domestic provinces, and international networks via road network,
railway, sea routes, inland waterway and air.


B. Geological formations
∗

1. Sedimentary formations

1.1. Clastic sedimentary rocks
Sedimentary rocks are the product of 1) weathering of preexisting rocks, 2) transport of the
weathering products, 3) deposition of the material, followed by 4) compaction, and 5) cementation of
the sediment to form a rock.


1.1.1. Do Son area
Đồ Sơn group including the Vạn Cảnh (D1-2-D2e vc), Dưỡng Động and Vạn Hương (D2gv vh).

a.

Van Canh Formation (D1-2-D2e vc)

This formations found in Bà Đế temple, Xóm Chẽ area, Hòn Dấu resort.
At Bà Đế temple, Northeast pole of Đồ Sơn peninsula, Hải Phòng,students can see a cliff with 25m
height and 50m long (from Bà Đế temple to 295 Hospital or healthcare facility) – Vạn Cảnh
formation. It also has expression of living organism.


A cliff at Ba De Temple about 20m height


∗

At Hòn Dấu resort, Hải Phòng, students also can see sandstone, siltstone, shale as same as Xóm
Chẽ rocks (Terrigenous sediment). At first observation Hòn Dấu resort is an artificial expression
about 100m height.

b. Duong Dong Formation
Not appear in the region.
c. Van Huong Formation
At Bà Đế temple, Northeast pole of Đồ Sơn peninsula, Hải Phòng far from 1.5 km is Vạn Hương
formation ( go with sealine).


∗
∗

The upper layer at Xóm Chẽ, Hải Phòng contain thick – beded layer follow one direction– show the
ocean enviroment.
Some charateristic of Vạn Hương formation: Almost they have bigger grain-side than Vạn
Cảnh formation. Geologist can find quartzitic sandstone easier than Vạn Cảnh formation. Fossil
appear at this place is Lepidodendropsis ( Vietnamese name: Hóa thạch cây dạng vảy)


The boundary between Vạn Cảnh and Vạn Hương formation (at Tổ Chẽ, Hải Phòng)


1.1.2. Kiến An area

∗

Terrigenous sediment in this area in part of Kien An formation ( Nguyen Quang Hap 1967). It has
been dated as Silurian and exposed in the Đại Hoàng, Phủ Diệm, Voi, Phủ Liễn, Xuân Sơn ( Kien
An, An Lao, Hai Phong City).

∗

The setting of this formation is: about 550m thick. Including:

−

sandstone, quartz, siltstone with interbeds of marl.

- thick- bedded limestone and marl with some interbeds of marl shale.


Kien An Formation


1.1.3 TRUNG HA BRIDGE AREA
- In Ma Chay Hill area : Neogene conglomerate :the size is different, sorting is
poorly – sorted, the composition include in quartz, sandstone and claystone, shape:
rounded. The common color is gray, brown. The arrangement has orientation cross.

Think in the past : formed in condition that water current flowed though.
The age of conglomerate is older than formation.

- Cliff near Da river bank : Neogene conglomerate: the size is small, wellsorted, the age of conglomerate is the same as formation


- Gas sation in Thai Hoa commune: hard coal have been foliated
with 6m height, black- shinny.

Trias age

1.1.4 XOM QUYT AREA

-

Cliff on the way to see Da ONG: claystone have
been foliated . Composition include in
sandstone mixture foliation claystone and
floliation limestone. The color from black- gray
to light gray

Sipay formation, Permian age.


1.2 Bio-chemical sedimentary rocks/ Đá trầm tích sinh hóa
Formed by water-soluble substances deposited down and coalesce. Small grains, mineral composition that is relatively
simple and more uniform uniform clastic sedimentary rocks. Limestone is mainly
1.2.1 Núi Voi Area
Composed of limestone with some interbeds of cherty shale. At the lowest of Con Voi formation, students can see
fossil: tetracoral and favositid fossil. Most of Con Voi information are fossil and foraminiferal.
In this area primarily limestone. Medium-bedded, thick-bedded

Episode 5: Clean limestone no limestone
Episode 4: Sand limestone
Episode 3: Siliceous limestone
Episode 2: Dark grey limestone
Episode 1: Dolomit limestone


Tetracoral fossil in Nui Con Voi ( hóa thạch san hô 4 tia)

Phtanite in Nui Con Voi (đá phiến sillic)


Con Voi Formation


1.2.2 Hon Che Area
Here is pure limestone , thickness of about 150-200m, including, in the lower part, black- grey, medium-bedded to
massive, fine-grained limestone, dolomitized in some places.

Limestone in Hon Che


2. Magmatic formations
2.1.Extrusive rocks/ Đá magma phun trào
2.1.1 Khoang Xanh Area
In this area, students see agglomerate (dăm kết núi lửa). Above the stone is located Siamese cross system
Basalt little Pebble, boulder is primarily.
In the source, the flow of power, the size grows glicial boulder.

Basalt in Khoang Xanh


2.1.2 Ba Vi National Park

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Doi Yen Ngua

The stones were weathering -> red, lamination.
Claystone but harder beacause of the oxit Fe.
Greater than 1300m basalt floors. Foliation of basalt slabs weak.
There are oriented parallel, Extrusive rock crystal with original architecture -> Eruptive activity in the past.

−

Cot 400
Here, extrusive rocks exposed in blocks, laminated signs.

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Top of the Mountain King
Extrusive rocks here resemble Yen Ngua Hill, phanerocryst geometry.

Conglomerate with phanerocryst architecture is original product of volcanic activity -> Volcanic bomb.


Conglomerate in Nui Voi