3D Geological Modeling in Northern Dandong, Liaoning Province,

China

Jinxin He, Linfu Xue, Yunliang Yu, Xiaoliang Lei and Xiaojun Liang

College of Earth Sciences, Jilin University, Changchun 130061 P.R. China

jxhe@ymail.com

Keywords: Deep Underground, 3D Geological Modeling, Northern Dandong.

Abstract: With the resources and environmental problem, population problem, the whole society of energy and mineral

resources demand more and more high, but with the resource of the earth's surface over the years of mining,

the reserves has far lower. On the surface of the earth to find ore has become more and more difficult, the

deep underground to find ore more and more and more attention by domestic and foreign researchers. During

the recent years, in the aspects of 3D geological modeling research results more and more, geological

information expression and record gradually by 2D conversion for 3D, so reliable and effective 3D geological

modeling method research become an important trend. Liaodong region is China's important metallogenic

belt in the study area at the mouth of the grass - Tongyuan synclinorium famous Maoling gold, lead and zinc

ore and coal. The research of deep geological structure in this area is good for studying the spatial distribution

of underground deep geological body, and puts forward the corresponding deep metallogenic

regularity. Through using the gravity and magnetic inversion method to the study area underground deep

geological structure of understanding, on the basis of this, using block modeling method, a 3D geological

model is established, finally in multiple aspects of structure, rock and the formation of underground deep

metallogenic regularity were analyzed.

1 INTRODUCTION

Dandong City, Liaoning Province, east and

Democratic People's Republic of Sinuiju across the

river, the geographical coordinates of longitude 124 °

23 ', latitude 40 ° 07'. Maximum horizontal distance

of 96 km, maximum longitudinal distance of 160 km,

120 km long coastline. Ideally, the annual average

temperature of 9 ℃, is one of the livable city. Area

high-speed railway, airport, port is developed, which

also makes it the Northeast region and an important

logistics hub in Northeast Asia. Extensive forest

cover in the region, rich in resources, has an important

ridge of gold mining and boron cat. The area is

located in one of the 12 significant mineralized zones,

is one of the key areas of mineral research, after years

of research which is located on the surface or the

surface of shallow mineral has been fundamental

discoveries, but in the area of minerals deep

underground the occurrence of still has great

potential. So the study area deep underground has

been paid more and more attentions.

2 DANDONG INCREASE

REGIONAL GEOLOGICAL

MAPPING

THREE-DIMENSIONAL MAPS

AND MAPPING PROCESS

2.1 The Study Area Tectonic Position

Liaoji rift mainly in eastern and southern Jilin

Province, Liaoning Province, located in Longgang

rangrim block and between blocks (Figure 2.2). Liaoji

rift within the development of a thick Proterozoic

volcanic - sedimentary rocks, in this study area is

mainly Liaohe Group, formed cap era 1700Ma, the

lower limit is 2200-2500Ma. Mainly grass estuary -

Tongyuanpu into south and north Liaohe Group

Liaohe Group, North Liaohe Group mainly develops

and nappe tectonic lineament, South Liaohe Group

fold structures are developed.

A large area of the study area exposed

Paleoproterozoic Liaohe Group in the study area

north east Neoproterozoic unconformably overlies

440

He J., Xue L., Lei X., Yu Y. and Liang X.

3D Geological Modeling in Northern Dandong, Liaoning Province, China.

DOI: 10.5220/0006028104400442

In Proceedings of the Information Science and Management Engineering III (ISME 2015), pages 440-442

ISBN: 978-989-758-163-2

the Liaohe Group. Liaoyang web junction with

Cambrian small area distribution and Ordovician,

research and development area in the northeast corner

area of Jurassic, near the eastern Mesozoic Komine

Caohekou distribution group.

2.2 Three-dimensional Modeling

Process

① Block Modeling② cutting section③ sectional drawing

④ inversion profiles⑤ block modeling⑥ block integration

Figure 1: Three-dimensional geological modeling process.

(1) Building Blocks Divided.

Divide principles: 1. if the block by the unconformity

traps can be divided directly; 2. if the block is large or

unconformity trap does not completely block is not

conducive to the 3D modeling, can be assisted by

adding reasonable line to complete; 3. If the presence

of the smaller rock invasion may temporarily without

treatment, in the post-processing (gravity and

magnetic inversion) in adding.

Object of study: 1. strata blocks, it is the focus of

research, including analysis of a variety of different

geological formations; 2. rock blocks, including

primary and secondary and eruption of magma body

is different; 3. fracture, including production faults.

like many other relations between geological factors

and fracture.

(2) Block Cutting Section.

Profile types: 1. a trunk inversion profile,

characterized by: setting can be cross-sectional

unlimited, cross-block research, geophysical and

other data needed to control the accuracy of the entire

area of study, the control link between blocks; 2.

Block control inversion profile, characterized in that:

setting can be cross-sectional analysis of unlimited,

geophysical and other information required in a single

block, three-dimensional modeling of the control and

finesse; 3. geologic modeling profile characterized. 4.

Set the cross section does not cross, to be the main

reference inversion sectional profile, forming a three-

dimensional model.

(3) Synthesis Constraints Subsurface Geological

Inference and Interpretation.

Various studies show that existing single technology

is difficult to directly understand the deep

underground, the joint inversion using gravity and

magnetic profiles implementation constraints deep

geological situation in the present study. Concrete

action is in reference rock samples on the basis of

physical properties (density and magnetic

susceptibility), complete inversion of the trunk

section in Geosoft software, determine the accurate

formation, rock, faults, folds spatial distribution

situation.

(4) Three-dimensional Geological Modeling.

The realization of three-dimensional geological

model adopted in GOCAD eventually generate, with

the gradual improvement IGeoMod software, which

sought to develop a three-dimensional function also

has tended to improve, and then in IGeoMod achieve

three-dimensional visualization can between.

(5) The model’s Modification and Integration.

By completing the trunk inversion profile can well

understand the deep geological structure of the entire

area through which to understand and realize the

connection between the block integration.

3 CONCLUSIONS

Based on the northern Dandong city’s very important

tectonic TongYuanPu - CaoHeKou Synclinorium

region, the deep geological structure, geological

modeling and deep metallogenic regularity region

have a preliminary understanding. Final Thoughts by

block modeling complete geological modeling of the

area.

(1) Liaohe Group in the region exposed a major

stratigraphic units on which the development of a

large number of folds, the lower boundary of Liaohe

Group recognize the basic geological its deepest

estuary should be on grass - tongyuanpu Complex

Syncline, a depth of about 5900m By region of the

gravity and magnetic data analysis and inversion, it

confirms the group's bottom boundary Liaohe basic

core of the syncline, depth of about 6000m, in line

with the basic geological facts. It can also reflect the

gravity and magnetic inversion can accurately reflect

the deep underground geological structure, gravity

and magnetic inversion provides an important tool for

the analysis of deep underground geological

formation.

(2) In the course of the three-dimensional modeling

of the region, for the special geological structure

(folding and fault development) in the region, using

block modeling. Model was done well in the area of

3D Geological Modeling in Northern Dandong, Liaoning Province, China

441

3D Geological Modeling in Northern Dandong, Liaoning Province, China

441

three-dimensional geological modeling, the ways to

simplify the modeling process, to achieve a

geological - geophysical data management, block

(unit) management, cutting section, section

management, 3D geological object generation, export

geophysical models.

(3) On the basis of the geological structure in the area

of deep analysis, the deep mineralization area got a

better understanding. First, the structure ore control

factors play a crucial role in the mineralization

process, the general area of mineralization in the

region are located in anticline core unit, part of the ore

deposits in cracks in the fault zone, in such a

configuration environment with conducive to

migration and enrichment of ore-forming elements.

Second, it features more magmatism presence around

the amount of deposit, to deposit the necessary heat

in the formation process. Finally, rock ore-controlling

role in the region is also obvious a lot of gold deposit

and other types of Pb-Zn occur in the bed and cover

Dashiqiao county groups.

ACKNOWLEDGEMENTS

This work was supported by National 973 Basic

Research Program of China (2015CB453000), Jilin

Province Foundation of Applicable Sciences

(20130102033JC) and Jilin Province Foundation of

Youngster Scientists (20130522106JH). We also

thank the anonymous reviewers for their helpful

suggestions.

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