chareteristics of young fold mountains
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Characteristics of young fold mountains (Himalayas) are as follows:
•Himalayas are made by the folding of sediments of Geo syncline known as "Tethys".
•It has three parallel ranges namely Himadri , Himachal and Shiwaliks.
•It is considered as youthful topography with high peaks and deep valleys.
•It is made up of sedimentary rocks.
•It is one of the recent landforms.
•It is considered as unstable landmass.
•It length is 2400km and width carries from 400km to 150km .
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Characteristics of young fold mountains (Himalayas) are as follows:
•Himalayas are made by the folding of sediments of Geo syncline known as "Tethys".
•It has three parallel ranges namely Himadri , Himachal and Shiwaliks.
•It is considered as youthful topography with high peaks and deep valleys.
•It is made up of sedimentary rocks.
•It is one of the recent landforms.
•It is considered as unstable landmass.
•It length is 2400km and width carries from 400km to 150km .
hope this helps you out dear!
and if it does u may Mark as brainliest ✌
Anonymous:
tysm fr brainliest ✌
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Answered by
3
Folded Mountains, especially the young folded mountains, represent the world's highest and most rugged mountains, and belong to the recently formed Alpine system.
The young folded mountains of the Alpine system circle the Pacific, and cross Eurasia from the Mediterranean to the Pacific, including such high ranges as the Andes, Sierra Nevada of California, the Cascades, the Canadian Rockies, the Alaska Range, the Alps, the Karakorum Ranges, and the Himalaya.
Characteristics of the folded mountains
(i) Folded mountains, young or old, were formed in a special type of narrow and elongated sea, called geosyncline.
(ii) These mountains are composed of sedimentary, igneous as well as metamorphic rocks, but the sedimentary rocks predominate and contain fossils which are marine is nature.
(iii) All folded mountains grew out of the sediments laid down is the geosyncline of a great geosynclinal sea in Mesozoic times.
(iv) Folded mountains are characterized by longer length and much shorter width. The Himalayas, for example, are 2400 km long and only 400 km wide.
(v) Young folded mountains represent the highest mountains on the earth. They have also highest mountain summits. Mt. Everest is the most typical example (8848m).
(vi) These mountains are generally arcuate in shape, and their length far exceeds their width.
(vii)The sediments deposited is the sea of Tethys were subjected to great pressure exerted by forelands, so young folded mountains have been characterized by widespread folds, faults and over-thrust masses.
(viii) Having been subjected to great pressure exerted by the tectonic forces, the rocks were subjected to intensive heat and pressure, so that they were metamorphosed on a large scale.
(ix) The great fractures created by faults provided suitable places for the deposits of valuable minerals such as gold, silver, tungsten, etc.
(x) Generally folded mountains are situated along the margins of the continents. Rockies and Andes, the two young folded mountains are found along the western margins of North and South Americas respectively. The Alpine-Himalayan Mountains however, are also located along the margins of continent flanked by the Tethys Sea.
(xi) As regards the structural characteristics of Fold Mountains, they include alternations of more or less open anticlines and synclines; closely packed isoclinal folds; and recumbent folds and thrusts.
Geosynclines:
Geosynclines are the birth places of the folded mountains on the earth. The geosynclinals concept is associated with the work done on the Appalachians.
It was discovered by James Hall in 1859 that the folded Paleozoic sediments of the mountain ranges are shallow-water marine types and their thickness far exceeded that of the unfolded strata of the same ages in the interior lowlands to the west.
Hall arrived at the conclusion that such a thick accumulation of sediments forming shales, limestones and sandstones clearly shows that the floor of the older underlying rocks must have subsided proportionately.
There was a long period of down-warping. During this period a perfect balance was reached between subsidence and sedimentation. In 1873, Dana coined the term 'geosynclinals' for such elongated belts of long-continued subsidence and sedimentation.
However, later on the term 'geosynclinals' was modified as 'geosyncline' which is being used even today. Thus, it is clear why the concept of geosynclines is ascribed to Hall and Dana.
In fact, Hall was the person who first of all suggested that mountain ranges and geosynclines are closely connected.
Keeping in view the huge thickness of sediments forming the Fold Mountains the suggestion was made that, as the sedimentation continued, the sea floor subsided so as to keep pace with it.
Geosyncline may be defined as a major structural down-fold in the earth's crust on a sub-continental scale.
It comprises a long and narrow basin in which considerable thick masses of sediment derived from neighbouring land masses are deposited. As the load of sediments continued to grow, there was progressive subsidence of the geosyncline floor.
The young folded mountains of the Alpine system circle the Pacific, and cross Eurasia from the Mediterranean to the Pacific, including such high ranges as the Andes, Sierra Nevada of California, the Cascades, the Canadian Rockies, the Alaska Range, the Alps, the Karakorum Ranges, and the Himalaya.
Characteristics of the folded mountains
(i) Folded mountains, young or old, were formed in a special type of narrow and elongated sea, called geosyncline.
(ii) These mountains are composed of sedimentary, igneous as well as metamorphic rocks, but the sedimentary rocks predominate and contain fossils which are marine is nature.
(iii) All folded mountains grew out of the sediments laid down is the geosyncline of a great geosynclinal sea in Mesozoic times.
(iv) Folded mountains are characterized by longer length and much shorter width. The Himalayas, for example, are 2400 km long and only 400 km wide.
(v) Young folded mountains represent the highest mountains on the earth. They have also highest mountain summits. Mt. Everest is the most typical example (8848m).
(vi) These mountains are generally arcuate in shape, and their length far exceeds their width.
(vii)The sediments deposited is the sea of Tethys were subjected to great pressure exerted by forelands, so young folded mountains have been characterized by widespread folds, faults and over-thrust masses.
(viii) Having been subjected to great pressure exerted by the tectonic forces, the rocks were subjected to intensive heat and pressure, so that they were metamorphosed on a large scale.
(ix) The great fractures created by faults provided suitable places for the deposits of valuable minerals such as gold, silver, tungsten, etc.
(x) Generally folded mountains are situated along the margins of the continents. Rockies and Andes, the two young folded mountains are found along the western margins of North and South Americas respectively. The Alpine-Himalayan Mountains however, are also located along the margins of continent flanked by the Tethys Sea.
(xi) As regards the structural characteristics of Fold Mountains, they include alternations of more or less open anticlines and synclines; closely packed isoclinal folds; and recumbent folds and thrusts.
Geosynclines:
Geosynclines are the birth places of the folded mountains on the earth. The geosynclinals concept is associated with the work done on the Appalachians.
It was discovered by James Hall in 1859 that the folded Paleozoic sediments of the mountain ranges are shallow-water marine types and their thickness far exceeded that of the unfolded strata of the same ages in the interior lowlands to the west.
Hall arrived at the conclusion that such a thick accumulation of sediments forming shales, limestones and sandstones clearly shows that the floor of the older underlying rocks must have subsided proportionately.
There was a long period of down-warping. During this period a perfect balance was reached between subsidence and sedimentation. In 1873, Dana coined the term 'geosynclinals' for such elongated belts of long-continued subsidence and sedimentation.
However, later on the term 'geosynclinals' was modified as 'geosyncline' which is being used even today. Thus, it is clear why the concept of geosynclines is ascribed to Hall and Dana.
In fact, Hall was the person who first of all suggested that mountain ranges and geosynclines are closely connected.
Keeping in view the huge thickness of sediments forming the Fold Mountains the suggestion was made that, as the sedimentation continued, the sea floor subsided so as to keep pace with it.
Geosyncline may be defined as a major structural down-fold in the earth's crust on a sub-continental scale.
It comprises a long and narrow basin in which considerable thick masses of sediment derived from neighbouring land masses are deposited. As the load of sediments continued to grow, there was progressive subsidence of the geosyncline floor.
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