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Garden's Decorative Rocks

A cache by RuiASP Send Message to Owner Message this owner
Hidden : 02/08/2018
1.5 out of 5
1.5 out of 5

Size: Size:   other (other)

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Geocache Description:



Guangdong Province: Morphology and tectonics:

The province of Guangdong is located in the subtropical zone of the south of China, with an approximate area of ​​180 000 km2. From the morphological point of view, it is constituted to the south by the Pearl River Delta and coastal zones, to the north by the Nanling range of predominant orientation E-W, by low mountains and terraces to the west, and mountains high and low to the east.

Tectonically, the province of Guangdong belongs to the Caledonian Fold Belt of the South China block and presents great content of metamorphic rocks of the Proterozoic, Cambrian, Ordovician and Silurian. The cover of the overlapping platform consists of stone and carbonate paths from Devonian to Mid Triassic which was bent and raised during the Indian Orogeny period.

Situated along the shores of the South China Sea, the Guangdong province reflects a complex geological history in which phenomena of rifting and tectonic compression occurred in the Paleogene, continuing to the Oligocene (~ 32Ma). These movements represented successive episodes of marine transgression and regression and deposition processes related to climatic and sea level aspects. During the rifting phase the margin was covered with terrigenous and hemiplagic sediments that were deposited and modified.

Sedimentary Basins:

The tectonic processes of rifting and compression, transgression and marine regression contributed to the generation of numerous sedimentary basins. There are about 108 sedimentary basins in Guangdong, although only 8 basins have an area of ​​more than 1000 km2, including the Sanshui, Maoming, Leiqiong, Dongguan, Xinhui, Kaiping and Nanxiong basins and Dengta, all continental sedimentary basins controlled by major NE faults and NW and EW fault faults and which were filled by lacustrine and volcanic fluvial lake sediments containing deposits of lignite, bituminous shale, gypsum, salts, fluorite, barite, copper and uranium.


The Earth Cache:

The Earth Cache is located in one of these sedimentary basins, particularly the Sanshiu sedimentary basin that covers the urban boundaries of the city of Guangzhou. This sedimentary basin consists of a depression with S-N orientation and is filled by Cretaceous and Paleocene lake sediments that constitute a mixture of plant and terrestrial debris as well as phytoplankton debris:

The distinct origin of sediments (terrestrial and marine environment) is directly associated with episodes of marine transgression and regression, or in other words, intermittent episodes of marine incursion that generated sediments that alternate laminated organic-rich  matter with organic microbioturbation, layers of gypsum indicating sedimentation of lake origin,  marls and dark sludge.

At the Gz you will be in a very central place of Guangzhou city and next to the beautiful Garden Hotel with its pleasant gardens and fountain, exotic decoration and chic atmosphere. Once you placed yourself at the spot you will come across a set of ornamental rocks that have been placed here for decorative effects. However, these rocks constitute clear examples of the type of sedimentation that occurred in the sedimentary basin of Sanshiu.

TO access the GZ please note that you have two options: Either you acess through the side gate which is more or less in front of Starbucks,

Or you may go inside Garden hotel using the main entrance to access the lobby. Then turn right and find your way to the side door, also in the same side if Starbucks. After crossing the door the set of rocks will be a fiew meters ahead

Your task is to carefully observe the rocks and answer the following questions via email from my profile in order to log the E.C.


1.With respect to their origin, sedimentary rocks obey a classification generically composed of three categories: In the sediments in front of you, you can see white bands or nodules. It will be plaster, very abundant in Saoshin Basin. You may also notice dark or black bands or nodules. These will be charcoal or oil shales from compaction of plant residues and, also of great abundance in Saoshin Basin.

Given that these sediments are gypsum and coal or oil shales, how would you classify these sediments from the viewpoint of their diagenesis or litification?

2.Provide a brief explanation, also naming the possible causes of the process, of how does marine transgression and regression contribute to the terrigenous and hemiplagic nature of these sediments?

 3. How many sedimentary rocks can you observe at the spot and what is the shape of the smallest sediment? Round, square, triangular or rectangular?

Official EarthCache

花園的裝飾岩石   廣東省:形態與構造: 廣東省位於中國南部的亞熱帶地區,面積約18萬平方公里。從形態上看,它是構成由珠三角和沿海地區以南,由主要方向EW的南嶺北部,低山和梯田到西部,以及山高和低的東部。 構造上,廣東省屬於加里東褶皺中國南方塊的皮帶,並提出了元古宙,寒武系,奧陶系和志留系變質岩偉大的內容。重疊平台的封面由泥盆紀三疊紀中期石和碳酸鹽蹊徑是彎曲和在印度造山運動期間提出。 廣東省坐落於中國南海的岸邊,反映了壓縮和構造的哪一個裂谷現象的複雜的地質歷史發生在古近紀,繼續漸新世(〜32毫安)。這些運動代表了與氣候和海平面相關的連續海相海侵和回歸沉積過程。在裂谷期,邊緣覆蓋著沉積和改造的陸源和半海洋沉積物。 沉積盆地: 裂谷和擠壓,海侵和海相退化的構造過程促成了許多沉積盆地的形成。在廣東有大約108沉積盆地,雖然只有八盆地擁有超過1000平方公里的區域,包括三水,茂名,雷瓊,東莞新會,開平南雄盆地和燈塔,所有主要控制的陸相沉積盆地NW和NE故障和故障,哪些是由湖泊湖和含褐煤,煙煤頁岩,石膏,鹽,螢石,重晶石,銅和鈾的火山沉積物河流沉積物填充的故障EW。                             地球緩存: 地球緩存位於這些沉積盆地之一,特別是Sanshiu沉積盆地闕覆蓋廣州市的城市邊界。與N-S取向抑鬱此沉積盆地於彼並且由白堊紀古和湖泊沉積物構成陸生植物的碎片和碎屑的混合物以及浮游植物填充: 沉積物的不同來源(陸地和海洋環境)直接與海侵和回歸的發作相關聯,或者換句話說,海洋侵入闕間歇發作生成的與有機microbioturbation交替層疊富含有機物,石膏層指示沉積物湖泊沉積,泥灰和黑色污泥。 在廣州,你會在一個非常集中的地方廣州市,毗鄰美麗的花園酒店以其宜人的花園和噴泉,情調裝飾和別緻的氛圍。一旦你將自己置於現場,你會遇到一系列裝飾性的岩石,這些岩石被放置在這裡用於裝飾效果。然而,這些岩石是三社沉積盆地沉積類型的明顯例子。 您的任務是仔細觀察岩石並通過電子郵件從我的個人資料中回答以下問題,以記錄E.C. : 1.採用尊重他們的原籍,沉積岩服從一般由三類分類:在你面前的沉積物中,你可以看到白色條紋或結節。這將是在Saoshin盆地石膏,非常豐富。您可能還會注意到黑色或黑色條紋或結節。這些將是來自Saoshin盆地的植物殘渣壓實的木炭或油頁岩,也是豐富的。 鑑於闕這些沉積物是石膏和煤或油頁岩,你會怎麼分類從他們的成岩作用或litification的觀點來看,這些沉積物? 2.提供一個簡要的解釋,也命名如何海侵和回歸有助於這些沉積物的陸源和hemiplagic自然的過程中可能的原因?  3.您現在可以觀察到多少個沉積岩,最小的沉積物的形狀是什麼?圓形,方形,三角形或矩形?

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