Standing on the precipice of the meeting of two continental plates are hyperactive
and cleaved fracture is often hit by the giant make Sumatra earthquake.
However, the continental shelf of this turmoil was also triggered the emergence
of a variety of valuable minerals on the island of Sumatra, especially gold.
Sumatra has long been famous as the Golden Island Svarnadwipa or because of the precious metals are traded in the old harbors on the island. Svarnadwipa term is mentioned in manuscripts and inscriptions in India.
Although gold production of Sumatra has long been known, the source of the mine remained a mystery until the 20th century. Some noted explorers, gold in Sumatra, many resulting from the interior, inhabited by wild men.
Start a new gold mined in Sumatra the Dutch around 1900, one of the oldest is in Lebong, Bengkulu, which is located at the foot of Bukit Barisan. In his article titled "Traditional Sumatran Trade" in the Bulletin de l'Ecole Française d'Extreme-Orient (1985), John N Miksic said, in the 18th century, the Dutch or the British did not realize was very close to a place so rich in gold , Lebong, which may have been cultivated for centuries by traditional communities.
Although it was the Netherlands and the UK have bought gold from local communities, they do not know the source of gold in Lebong it. William Marsden, British officials, said in his book History of Sumatra (1783), the gold allegedly mined around Fort Marlborough on the coast of Bengkulu.
A huge success
Formation of new Lebong known Dutch in the 1890s and has since been exploited to death. In the book Mining in the Netherlands East Indies, Alex L was Braake said, Mijnbouw Maatschappij mining company began operations in Lebong Simau Mark since 1910 and hugely successful.
Recent exploration found that the gold line coincides with the Sumatra fault line was written as MJ Crow and TM Van Leeuwen in the book Sumatra: Geology, Resources and Tectonic Evolution (2005). This gold mineralization processes mentioned occur simultaneously with the appearance of arc magmas along the Bukit Barisan.
Subduction plate (ocean) to the Indo-Australia plate (continental) Eurasia has triggered the formation of arc magmas along the fault lines. At a depth of 150-200 kilometers, the temperature of the Earth so hot that the rocks in the contact zone of the two plates are melted. Corresponding properties of the fluid, molten rock rises to the top of this heat formed pockets of hot porridge rock known as magma chamber.
Magma interaction with bedrock, at a certain pressure, causing the formation of alteration zones in the host rock of lava and tuffs which then acts as a mineral-rich host rock (host rock), including gold.
In the end, it urged the magma to the surface to form a row or rows of magma dome volcanoes along the Bukit Barisan. Formation of magma dome is also used to promote basic rocks in the bottom of the Ocean to the summit of Bukit Barisan.
Appointment
Traces the appointment of Bukit Barisan was also found Dimsik, stone craftsmen from Bengkulu. A dozen years he was hunting precious stones along the Bukit Barisan, one of which fossil stone. "Surprisingly, I found a lot of honey in the rock peaks," said Dimsik.
Honey is a term Dimsik stone for fossil rocks. Once polished, fossilized rock honey is used as a stone ring. Dimsik honey showed a variety of stone that still shows a hollow structure resembling rocks. Some white, but much too colorful.
According to him, which they were discovered it was the rock of the mountain peaks in the Bukit Barisan and its location is very far from the coast seeds. One location was the discovery of Bukit Batu Api Luang Saung Muara District, District Kaur, Bengkulu. Located 1,500 meters above sea level at a distance of about 35 kilometers from the coastline.
Geophysics expert Padang Andalas University, Badrul Mustafa, said the discovery of a fossilized coral reef fossils tens of kilometers from the coast is clear evidence of the appointment of the seabed in the past. "The events that occurred millions of years ago as the formation of Bukit Barisan," he said.
Chairman of the Regional Board Indonesian Geologists Association (IAGI) West Sumatera Province Ade Edward said, rocks fossils as part of the bedrock formed in many areas, especially the older continental crust. The island of Borneo is one of the old area, the tectonic activity and the relative vulkanisnya're done. "For this reason, many diamonds are found in Borneo," said Ade.
Nevertheless, on the island of Sumatra and tectonic processes vulkanisnya likely still active, but many found the bedrock formations. Like a stone ring in Bengkulu, which according to Ade has a high silica composition and is known as onyx.
In addition to fossil corals along the Bukit Barisan also found fossilized wood (silicified wood) that undergo metamorphosis due to temperature and high pressure. In fact, in Bengkulu are also found fossilized tree sap. "This is the most difficult pembatuan process because of the carbon to silica without changing its shape," said Ade.
This further confirmed that traces of the past must have been the removal of the Sumatran mainland relative to sea level. "The stone ring is a splinter of the old rocks of an age older than the eruption of Toba. This is the bedrock. While petrified wood fossils believed to be the first tree that grows in the earth, "said Ade.
Because it is formed in the early phase of formation of the earth, according to Ade, bedrock geological processes have been recorded in Sumatra are hyperactive during millions of years.
Sumatra has long been famous as the Golden Island Svarnadwipa or because of the precious metals are traded in the old harbors on the island. Svarnadwipa term is mentioned in manuscripts and inscriptions in India.
Although gold production of Sumatra has long been known, the source of the mine remained a mystery until the 20th century. Some noted explorers, gold in Sumatra, many resulting from the interior, inhabited by wild men.
Start a new gold mined in Sumatra the Dutch around 1900, one of the oldest is in Lebong, Bengkulu, which is located at the foot of Bukit Barisan. In his article titled "Traditional Sumatran Trade" in the Bulletin de l'Ecole Française d'Extreme-Orient (1985), John N Miksic said, in the 18th century, the Dutch or the British did not realize was very close to a place so rich in gold , Lebong, which may have been cultivated for centuries by traditional communities.
Although it was the Netherlands and the UK have bought gold from local communities, they do not know the source of gold in Lebong it. William Marsden, British officials, said in his book History of Sumatra (1783), the gold allegedly mined around Fort Marlborough on the coast of Bengkulu.
A huge success
Formation of new Lebong known Dutch in the 1890s and has since been exploited to death. In the book Mining in the Netherlands East Indies, Alex L was Braake said, Mijnbouw Maatschappij mining company began operations in Lebong Simau Mark since 1910 and hugely successful.
Recent exploration found that the gold line coincides with the Sumatra fault line was written as MJ Crow and TM Van Leeuwen in the book Sumatra: Geology, Resources and Tectonic Evolution (2005). This gold mineralization processes mentioned occur simultaneously with the appearance of arc magmas along the Bukit Barisan.
Subduction plate (ocean) to the Indo-Australia plate (continental) Eurasia has triggered the formation of arc magmas along the fault lines. At a depth of 150-200 kilometers, the temperature of the Earth so hot that the rocks in the contact zone of the two plates are melted. Corresponding properties of the fluid, molten rock rises to the top of this heat formed pockets of hot porridge rock known as magma chamber.
Magma interaction with bedrock, at a certain pressure, causing the formation of alteration zones in the host rock of lava and tuffs which then acts as a mineral-rich host rock (host rock), including gold.
In the end, it urged the magma to the surface to form a row or rows of magma dome volcanoes along the Bukit Barisan. Formation of magma dome is also used to promote basic rocks in the bottom of the Ocean to the summit of Bukit Barisan.
Appointment
Traces the appointment of Bukit Barisan was also found Dimsik, stone craftsmen from Bengkulu. A dozen years he was hunting precious stones along the Bukit Barisan, one of which fossil stone. "Surprisingly, I found a lot of honey in the rock peaks," said Dimsik.
Honey is a term Dimsik stone for fossil rocks. Once polished, fossilized rock honey is used as a stone ring. Dimsik honey showed a variety of stone that still shows a hollow structure resembling rocks. Some white, but much too colorful.
According to him, which they were discovered it was the rock of the mountain peaks in the Bukit Barisan and its location is very far from the coast seeds. One location was the discovery of Bukit Batu Api Luang Saung Muara District, District Kaur, Bengkulu. Located 1,500 meters above sea level at a distance of about 35 kilometers from the coastline.
Geophysics expert Padang Andalas University, Badrul Mustafa, said the discovery of a fossilized coral reef fossils tens of kilometers from the coast is clear evidence of the appointment of the seabed in the past. "The events that occurred millions of years ago as the formation of Bukit Barisan," he said.
Chairman of the Regional Board Indonesian Geologists Association (IAGI) West Sumatera Province Ade Edward said, rocks fossils as part of the bedrock formed in many areas, especially the older continental crust. The island of Borneo is one of the old area, the tectonic activity and the relative vulkanisnya're done. "For this reason, many diamonds are found in Borneo," said Ade.
Nevertheless, on the island of Sumatra and tectonic processes vulkanisnya likely still active, but many found the bedrock formations. Like a stone ring in Bengkulu, which according to Ade has a high silica composition and is known as onyx.
In addition to fossil corals along the Bukit Barisan also found fossilized wood (silicified wood) that undergo metamorphosis due to temperature and high pressure. In fact, in Bengkulu are also found fossilized tree sap. "This is the most difficult pembatuan process because of the carbon to silica without changing its shape," said Ade.
This further confirmed that traces of the past must have been the removal of the Sumatran mainland relative to sea level. "The stone ring is a splinter of the old rocks of an age older than the eruption of Toba. This is the bedrock. While petrified wood fossils believed to be the first tree that grows in the earth, "said Ade.
Because it is formed in the early phase of formation of the earth, according to Ade, bedrock geological processes have been recorded in Sumatra are hyperactive during millions of years.
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