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2020 Vol.55, Issue 4 Preview Page

Research Article

Spatial Analysis for Detrital Zircon Provenance Study: An Initial Study

쇄설성 저어콘 기원지 연구를 위한 공간 분석법: 초기 연구

Ara Jeonga*
정 아라a*
aResearch Professor, Department of Geography Education, Korea University
a고려대학교 지리교육과 연구교수
* Corresponding Author
31 August 2020. pp. 439-451
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Abstract

Detrital zircon age distribution obtained from clastic sediments is a widely used method for the study of geological provenance. One approach in provenance research involves using detrital zircon (DZ) dating results to evaluate contributing source areas. The standard method involves a qualitative interpretation based on knowledge of researcher on the geological mapping of potential source regions. This study presents a new quantitative method to estimate DZ provenance using spatial analysis performed with Python Spatial Analysis Library (PySAL). In the modern study area, the Salt and Verde River in Arizona, USA, currently drain a large upland region and flow through transverse ranges down to the Phoenix metropolitan region. Prior to the Quaternary, however, the study area existed as a series of endorheic drainages in the Basin and Range Province. The general assumption made in DZ studies is that the areal distribution of geological units reflects the DZs collected from samples, in this case representing pre- and post- river arrivals in sediments extracted from in drilled wells. This study explains the development of a new method to quantify provenance of DZ through spatial analysis and to better understand the paleogeographic evolution of this region of central Arizona, USA.

Keywords
Detrital Zircon, Geochemistry
Geological provenance
Geomorphology
Interdisciplinary research
PySAL
Python
Spatial analysis
Weighted mean

쇄설성 퇴적물에서 획득한 쇄설성 저어콘 연대분포는 주로 지구과학에서 기원지를 추적하는 데 널리 사용되는 방법이다. 그 기본 원리는 쇄설성 퇴적물이 유래한 유역에 분포하는 암석들의 생성시기를 반영할 것이므로, 특정 시기에 집중된 연대들을 바탕으로 해당 유역분지에 분포하는 암석들을 추론하는 것인데, 이러한 추론은 주로 연구자의 정성적 평가를 바탕으로 이루어져 왔으며, 정량적인 평가는 거의 이루어지지 않았다. 이에 본 연구에서는 쇄설성 저어콘 기원지 연구를 위한 정량적 평가방법에 대한 필요성에 기인하여 파이썬(Python) 기반의 오픈 소스 라이브러리인 파이쌀(PySAL)을 이용한 공간 분석법을 처음으로 개발하여 정량적 평가를 수행하였다. 한편, 쇄설성 저어콘 연대분포가 획득된 연구지역인 미국 애리조나주 살트 강과 버디 강 유역은 지형경관의 발달 과정에 있어 흥미로운 지역이다. 현재 두 강은 산맥을 넘어 피닉스 대도시권을 가로질러 흐르지만, 과거에는 연구지역이 지금과 같이 큰 유역분지를 가진 것이 아니라 분지-산맥 지역(Basin and Range Province)에서 전형적으로 나타나는 닫혀진 구조분지형태로 존재했으며 따라서 유역분지의 크기 또한 매우 작았을 것으로 생각된다. 따라서 두 강이 산맥을 넘어오기 전의 퇴적물에서 측정된 쇄설성 저어콘 연대분포와 그 이후의 퇴적물에서 측정된 쇄설성 저어콘 연대분포가 각각 다른 크기의 유역분지에 분포하는 암석들을 반영한다면, 이는 연구지역의 지형경관 발달 과정을 밝히는 데 큰 도움이 될 수 있다. 본 연구는 학제간 연구로, 지구화학적 연구방법으로 주로 사용되었던 쇄설성 저어콘 기원지 연구에 대하여, 공간 분석을 사용하여 정량화하고, 이를 통해 지형학적 문제를 풀어내는 데 도움을 주는 것을 목표로 한다.

키워드
쇄설성 저어콘
지구화학
지질학적 기원지
지형학
학제간 연구
파이쌀
파이썬
공간 분석
가중 평균
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Information
  • Publisher :The Korean Geographical Society
  • Publisher(Ko) :대한지리학회
  • Journal Title :Journal of the Korean Geographical Society
  • Journal Title(Ko) :대한지리학회지
  • Volume : 55
  • No :4
  • Pages :439-451
  • Received Date : 2020-06-23
  • Revised Date : 2020-07-20
  • Accepted Date : 2020-07-27
  • DOI :https://doi.org/10.22776/kgs.2020.55.4.439
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