Honggeertu

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Coordinates: 41°28′N113°00′E / 41.47°N 113°E / 41.47; 113 [1] Honggeertu is a volcanic field in China, in the Nei Mongol Province. [1]

Geographic coordinate system Coordinate system

A geographic coordinate system is a coordinate system that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are often chosen such that one of the numbers represents a vertical position and two or three of the numbers represent a horizontal position; alternatively, a geographic position may be expressed in a combined three-dimensional Cartesian vector. A common choice of coordinates is latitude, longitude and elevation. To specify a location on a plane requires a map projection.

Volcanic field Area of the Earths crust prone to localized volcanic activity

A volcanic field is an area of the Earth's crust that is prone to localized volcanic activity. They usually contain 10 to 100 volcanoes such as cinder cones and are usually in clusters. Lava flows may also occur. They may occur as a monogenetic volcanic field or a polygenetic volcanic field.

China Country in East Asia

China, officially the People's Republic of China (PRC), is a country in East Asia and the world's most populous country, with a population of around 1.404 billion. Covering approximately 9,600,000 square kilometers (3,700,000 sq mi), it is the third- or fourth-largest country by total area. Governed by the Communist Party of China, the state exercises jurisdiction over 22 provinces, five autonomous regions, four direct-controlled municipalities, and the special administrative regions of Hong Kong and Macau.

The field is formed by twelve basaltic cinder cones. [1] Some of the cones formed on a fault. [2] It may be of Holocene age. [1] Young lava flows from this field look much younger than these of Quaternary volcanoes in the neighbourhood. [3] The volcanism may originate in the tectonic effects of the movement of the Ordos Block. Seismic tomography indicates the presence of a low velocity region at the volcano. [4]

Cinder cone A steep conical hill of loose pyroclastic fragments around a volcanic vent

A cinder cone is a steep conical hill of loose pyroclastic fragments, such as either volcanic clinkers, cinders, volcanic ash, or cinder that has been built around a volcanic vent. They consist of loose pyroclastic debris formed by explosive eruptions or lava fountains from a single, typically cylindrical, vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as either cinders, clinkers, or scoria around the vent to form a cone that often is symmetrical; with slopes between 30–40°; and a nearly circular ground plan. Most cinder cones have a bowl-shaped crater at the summit.

In geology, a fault is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement as a result of rock-mass movement. Large faults within the Earth's crust result from the action of plate tectonic forces, with the largest forming the boundaries between the plates, such as subduction zones or transform faults. Energy release associated with rapid movement on active faults is the cause of most earthquakes.

Holocene The current geological epoch, covering the last 11,700 years

The Holocene is the current geological epoch. It began approximately 11,650 cal years before present, after the last glacial period, which concluded with the Holocene glacial retreat. The Holocene and the preceding Pleistocene together form the Quaternary period. The Holocene has been identified with the current warm period, known as MIS 1. It is considered by some to be an interglacial period within the Pleistocene Epoch.

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References

  1. 1 2 3 4 "Honggeertu". Global Volcanism Program . Smithsonian Institution.
  2. ↑ Whitford-Stark, J. L. (1987). "A survey of Cenozoic volcanism on mainland Asia". 213: 1–74. doi:10.1130/SPE213-p1. ISSN   0072-1077.
  3. ↑ Wei, H.; Sparks, R.S.J.; Liu, R.; Fan, Q.; Wang, Y.; Hong, H.; Zhang, H.; Chen, H.; Jiang, C.; Dong, J.; Zheng, Y.; Pan, Y. (February 2003). "Three active volcanoes in China and their hazards". Journal of Asian Earth Sciences. 21 (5): 516. doi:10.1016/S1367-9120(02)00081-0.
  4. ↑ Zheng, Yong; Shen, Weisen; Zhou, Longquan; Yang, Yingjie; Xie, Zujun; Ritzwoller, Michael H. (2011). "Ambient Noise Tomography of North east ern China, the Korean Peninsula, and the Sea of Japan". Journal of Geophysical Research: 18–19. Retrieved 3 November 2016.
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