The crater has a diameter of 2.6 km together with it is covered past times the Lake Summasjärvi (Summanen), almost ix km south-east of the nearest city, Saarijärvi, together with 275 km N of Helsinki. The historic menses of the deport on lawsuit together with the type of the meteorite causing the crater, are silent unknown.
 |
| Left: the location of Summanen deport on crater inwards Republic of Finland amid the other xi deport on structures. Right: The coastline of Lake Summanen is shown inwards red. The topographic heights together with the lake depths are shown every bit reliefs: chocolate-brown depicts topographic hills, greenish apartment terrane together with bluish deep water, respectively. The crater itself is estimated as broken xanthous contour. The impacted rocks accept been flora inwards the mainland, towards SE from the centre of the deport on [Credit: Jüri Plado] |
Researchers flora shatter cones, fractured together with brecciated rocks inwards Summanen area
The Summanen geophysical characteristic was showtime identified inwards the early on 2000's past times Jouko Vanne, a geologist at the Geological Survey of Finland. The observation was based on depression height aeroelectromagnetic information that revealed round off electromagnetic apparent resistivity anomaly associated alongside Lake Summanen. The meteorite deport on theory got a farther boot inwards summertime of 2017, when the Finnish-Estonian squad flora inevitable evidences of traces of a meteorite hit.
In particular, shatter cones, fractured together with brecciated rocks were discovered inwards Summanen area. The microscope studies of sparse sections of shocked rocks attempt the meteorite deport on interpretation together with disclose huge daze pressures suffered past times the local basement rocks. In fourth dimension of the crater formation, the diameter has been larger compared to the introduce 2.6 km since the erosion past times geological processes, augmented past times glaciations, accept diminished the master crater size.
There are directly 191 confirmed meteorite deport on structures on Earth
Summanen is 191st confirmed meteorite deport on construction on the surface of planet Earth. The non bad bulk is flora on continental areas alongside solely a few oceanic impacts. Although inwards global perspective the Summanen belongs to the grouping of small-scale craters, it, together alongside the xi previously proven deport on structures inwards Finland, places Republic of Finland into ane of the leading countries to regain deport on structures.
The largest deport on construction inwards Finland, the Keurusselkä construction locating likewise inwards Central Finland, has a diameter of >30 km alongside an historic menses of almost 1100 1000000 years. The Summanen explosion has been much smaller, but, nevertheless, produced a large impairment inwards the environment.
The regain was published inwards the magazine Meteoritics & Planetary Science.
Source: University of Helsinki [June 27, 2018]
Sumber http://archaeologynewsnetwork.blogspot.com
Buat lebih berguna, kongsi:
