2020年1月4日星期六

馬屎洲地質考察

馬屎洲地質考察地點 http://www.arcgis.com/home/webmap/viewer.html?webmap=3a637c064fb34c9d8849459ba81cb4e7
GEO PARK LEAFLET https://www.geopark.gov.hk/eleaflet/pdf/07-E-leaflet-Ma-Shi-Chau.pdf
HKU https://web.hku.hk/~chanls/Teaching_Resources/fieldTripGuides/ma%20sze%20chau%20_EDB.pdf
HONG KONG GEOLOGICAL HISTORY https://www.edb.gov.hk/attachment/en/curriculum-development/kla/pshe/references-and-resources/geography/VolcanicGeology.pdf

The Geological Stratigraphy in the Northwestern Ma Shi Chau Hardcover – 26 January 2017

by Shing-Cheong Francis Law (Author), 羅承昌 (Creator)

This dissertation, "The Geological Stratigraphy in the Northwestern Ma Shi Chau" by Shing-cheong, Francis, Law, 羅承昌, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author.

Abstract:

Before the year 2000, the sedimentary and volcano-sedimentary rocks on Ma Shi Chau (MSC) have long been regarded as the formations in Permian and Jurassic respectively. Geotechnical Engineering Office (GEO) had modified the geological model and changed the Northeastern side of MSC, the pre-volcanic sedimentary rocks, to an older rock formation, from Permian Tolo Harbour Formation to Devonian Bluff Head Formation. The reasons of change are mainly from structural evidence and lithological evidence.

But they are still indirect evidences; no fossil was found in the sedimentary sequences at the hinging wall till to the northwestern shore of Ma Shi Chau. Fossils were only found along the southeastern shore of Ma Shi Chau for the footwall of the reverse fault, which are of Permian age.

Through the analysis of the photomicrographs, the Unknown group is difficult to show which formations, the Devonian or Permian is closer to as the Unknown group have similar characteristics of both. For the geochemistry analysis by using different graphs, the patterns of each group are revealed.

From the graphs produced, generally the Unknown group have pattern closer to the Permian Tolo Harbor Formation. But there is still no direct evidence that the Unknown group is within the Permian Tolo Harbor Formation. By the geochemical data it is more likely for the Unknown group to be close the Permian rocks.

DOI: 10.5353/th_b5094852
Subjects:
Geology, Stratigraphic
Geology - China - Hong Kong

https://www.amazon.ae/Geological-Stratigraphy-Northwestern-Shi-Chau/dp/1361001356

AFCD

地質公園土地利用的爭議

2017年4月29日星期六

馬屎洲

本港岩石表層發現最古老的岩石是泥盆紀(devonian)年代的bluff head island 黃竹角咀，鬼手/肥燒肉。這個地方是屬於地質歷史中二疊紀(permeian)年代的沉積岩，距今約2.9～2.5億年前古生代的最後一個地質年代是香港第二歷史最古老的石頭。在這兩個時期中，香港時而被海洋淹沒，有利不同類型的沉積岩形成。這些年代的岩石，都是位於香港東北部屬於沉積岩地質公園園區內。

之後，香港進入侏羅紀年代，香港東北有非常活躍的火山活動，造成了大規模的火山地貌，包括噴出地面的凝灰岩tuff，和在地殼內部形成的花崗岩granite。在馬屎洲上也會見到這兩種岩石的出現。因此，也會看到一些有關岩石活動的過程如褶曲、斷層作用之類的痕跡。