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Geology Of Lebanon
The geology of Lebanon remains poorly studied prior to the Jurassic. The country is heavily dominated by limestone, sandstone, other sedimentary rocks, and basalt, defined by its tectonic history. In Lebanon, 70% of exposed rocks are limestone karst. Tectonic situation Lebanon's tectonic history is closely related to the Levant Fracture System, a left-lateral strike-slip fault zone, separating the Arabian Plate from the African Plate. The intracontinental Palmyride fold belt, with a maximum elevation of above sea level, is an important structural feature that dominates much of Lebanon and Syria, extending northeast towards the Euphrates Graben from the Levant Fracture System. The fold belt extends in total, with fold wavelengths of . The fold belt forms ridges and small depressions filled with clastic material from the Paleogene, Neogene and Quaternary. Geologists debate whether the Anti-Lebanon Mountains are part of the southern extent of the fold belt and whether some faults ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monocline
A monocline (or, rarely, a monoform) is a step-like fold in rock strata consisting of a zone of steeper dip within an otherwise horizontal or gently dipping sequence. Formation Monoclines may be formed in several different ways (see diagram) * By differential compaction over an underlying structure, particularly a large fault at the edge of a basin due to the greater compactibility of the basin fill, the amplitude of the fold will die out gradually upwards. * By mild reactivation of an earlier extensional fault during a phase of inversion causing folding in the overlying sequence. * As a form of fault propagation fold during upward propagation of an extensional fault in basement into an overlying cover sequence. * As a form of fault propagation fold during upward propagation of a reverse fault in basement into an overlying cover sequence. Examples * Waterpocket Fold in Capitol Reef National Park, Utah * Comb Ridge in southern Utah * Grandview-Phantom Monocline in Gra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rheic Ocean
The Rheic Ocean (; ) was an ocean which separated two major paleocontinents, Gondwana and Laurussia ( Laurentia- Baltica- Avalonia). One of the principal oceans of the Paleozoic, its sutures today stretch from Mexico to Turkey and its closure resulted in the assembly of the supercontinent Pangaea and the formation of the Variscan– Alleghenian– Ouachita orogenies. Etymology The ocean located between Gondwana and Laurentia in the Early Cambrian was named for Iapetus, in Greek mythology the father of Atlas (from which source the Atlantic Ocean ultimately gets its name), just as the Iapetus Ocean was the predecessor of the Atlantic Ocean. The ocean between Gondwana and Laurussia ( Laurentia– Baltica– Avalonia) that existed from the Early Ordovician to the Early Carboniferous was named the Rheic Ocean after Rhea, sister of Iapetus. Geodynamic evolution At the beginning of the Paleozoic Era, about 540 million years ago, most of the continental mass on Earth was clu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laurussia
Laurasia () was the more northern of two large landmasses that formed part of the Pangaea supercontinent from around (Million years ago, Mya), the other being Gondwana. It separated from Gondwana (beginning in the late Triassic period) during the breakup of Pangaea, drifting further north after the split and finally broke apart with the opening of the North Atlantic Ocean 56 Mya. The name is a Blend word, portmanteau of Laurentia and Eurasian_plate, Eurasia. Laurentia, Avalonia, Baltica, and a series of smaller terranes, collided in the Caledonian orogeny c. 400 Mya to form Laurussia. Laurussia then collided with Gondwana to form Pangaea. Kazakhstania and Siberia (continent), Siberia were then added to Pangaea 290–300 Mya to form Laurasia. Laurasia finally became an independent continental mass when Pangaea broke up into Gondwana and Laurasia. Terminology and origin of the concept Laurentia, the Paleozoic, Palaeozoic Craton, core of North America and continental ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gondwana
Gondwana ( ; ) was a large landmass, sometimes referred to as a supercontinent. The remnants of Gondwana make up around two-thirds of today's continental area, including South America, Africa, Antarctica, Australia (continent), Australia, Zealandia, Arabian Peninsula, Arabia, and the Indian subcontinent. Gondwana was formed by the Accretion (geology), accretion of several cratons (large stable blocks of the Earth's crust), beginning with the East African Orogeny, the collision of India and Geography of Madagascar, Madagascar with East Africa, and culminating in with the overlapping Brasiliano orogeny, Brasiliano and Kuunga orogeny, Kuunga orogenies, the collision of South America with Africa, and the addition of Australia and Antarctica, respectively. Eventually, Gondwana became the largest piece of continental crust of the Paleozoic Era, covering an area of some , about one-fifth of the Earth's surface. It fused with Laurasia during the Carboniferous to form Pan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Paleozoic
The Paleozoic ( , , ; or Palaeozoic) Era is the first of three Era (geology), geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma at the start of the Mesozoic Era. The Paleozoic is subdivided into six period (geology), geologic periods (from oldest to youngest), Cambrian, Ordovician, Silurian, Devonian, Carboniferous and Permian. Some geological timescales divide the Paleozoic informally into early and late sub-eras: the Early Paleozoic consisting of the Cambrian, Ordovician and Silurian; the Late Paleozoic consisting of the Devonian, Carboniferous and Permian. The name ''Paleozoic'' was first used by Adam Sedgwick (1785–1873) in 1838 to describe the Cambrian and Ordovician periods. It was redefined by John Phillips (geologist), John Phillips (1800–1874) in 1840 to cover the Cambrian to Permian periods. It is derived from the Ancient Greek, Greek ''palaiós'' (πΠ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Serghaya
Serghaya or Sirghaya () is a small town located in the Damascus countryside in south west Syria. According to the Syria Central Bureau of Statistics (CBS), Serghaya had a population of 7,501 in the 2004 census. Geography It is from Damascus and above sea level. It is at the foot of the Anti-Lebanon Mountain. Serghaya has a moderate climate with a temperature that varies from 25 to 32 degrees Celsius all summer season and cold climate with temperature varies from -5 up to 10 all winter when snow covers the land and mountain. It is connected to Damascus via Al-Zabadani and also has old rail reaches to Beirut via Riyaq (or Rayak), Bekaa. Nearby Towns * West : `Utayb (3.5 nm) * North: Yahfufah (3.4 nm), Al Khuraybah (4.0 nm), Ma`rabun (3.4 nm) * East: Al `Uwayni (0.4 nm) * South: `Ayn al Hawr (2.2 nm) Climate In Serghaya, there is a cool summer Mediterranean climate. Rainfall is higher in winter than in summer. The Köppen-Geiger climat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dead Sea Transform
The Dead Sea Transform (DST) fault system, also sometimes referred to as the Dead Sea Rift, is a series of Fault (geology), faults that run for about 1,000 km from the Marash triple junction (a junction with the East Anatolian Fault in southeastern Turkey) to the northern end of the Red Sea Rift (just offshore of the southern tip of the Sinai Peninsula). The fault system forms the transform fault, transform boundary between the African plate to the west and the Arabian plate to the east. It is a zone of left lateral Sinistral and dextral#Geology, (sinistral) displacement, signifying the relative motions of the two plates. Both plates are moving in a general north-northeast direction, but the Arabian plate is moving faster, resulting in the observed left lateral motions along the fault of approximately 107 km at its southern end. A component of extension is also present in the southern part of the transform, which has contributed to a series of depressions, or pull-apart b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mount Hermon
Mount Hermon ( / ALA-LC: ('Mountain of the Sheikh', ), , ) is a mountain, mountain cluster constituting the southern end of the Anti-Lebanon mountain range. Its summit straddles the Lebanon–Syria border, border between Syria and Lebanon and, at above sea level, is the highest point in Syria, and the Israeli occupation of the Golan Heights, Israeli-occupied Golan Heights. On the top, in the United Nations Disengagement Observer Force, United Nations buffer zone between Syrian and Israeli-occupied territories, is the highest permanently manned UN position in the world, known as "Hermon Hotel", located at . The southern slopes of Mount Hermon extend to the Israeli-occupied portion of the Golan Heights, where the Mount Hermon ski resort is located with a top elevation of . Geography Wider mountain range The Anti-Lebanon range, of which the Hermon range constitutes the southernmost part, extends for approximately in a northeast–southwest direction, running parallel to the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Houleh Depression
The Houla Region or Houla Plain ( ''Al-Ḥūla'') is an area consisting of three villages in the Homs Governorate of central Syria, northwest of the city of Homs. The biggest village in the Houla region had 20,041 inhabitants in 2004 and is called Kafr Laha. The second largest village, Taldou, had 15,727 inhabitants in 2004 and is located in the outskirts of Houla. The third village, Tell Dahab had 12,055 inhabitants in 2004. The settlement is essentially a Turkmen Sunni Muslim town, where Turkish language is widely spoken among its people. Houla is also surrounded by Alawite neighboring villages. Many of the inhabitants of the Houla village cluster are of Turkmen descent. Houla was described by 19th-century English scholar Eli Smith as a low-lying tract of land situated at the eastern slope of the Syrian Coastal Mountain Range. The 13th-century Syrian geographer Yaqut al-Hamawi visited al-Houla in 1226 during Ayyubid rule noting that the place belonged to Jund Hims ("militar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alluvial Fan
An alluvial fan is an accumulation of sediments that fans outwards from a concentrated source of sediments, such as a narrow canyon emerging from an escarpment. They are characteristic of mountainous terrain in arid to Semi-arid climate, semiarid climates, but are also found in more humid environments subject to intense rainfall and in areas of modern glaciation. They range in area from less than to almost . Alluvial fans typically form where a flow of sediment or rocks emerge from a confined channel and are suddenly free to spread out in many directions. For example, many alluvial fans form when steep mountain valleys meet a flat plain. The transition from a narrow channel to a wide open area reduces the carrying capacity of flow and results in Deposition (geology), deposition of sediments. The flow can take the form of infrequent debris flows like in a landslide, or can be carried by an intermittent stream or creek. The reduction of flow is key to the formation of alluvial ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quaternary
The Quaternary ( ) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS), as well as the current and most recent of the twelve periods of the Phanerozoic eon. It follows the Neogene Period and spans from 2.58 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene (2.58 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today); a proposed third epoch, the Anthropocene, was rejected in 2024 by IUGS, the governing body of the ICS. The Quaternary is typically defined by the Quaternary glaciation, the cyclic growth and decay of continental ice sheets related to the Milankovitch cycles and the associated climate and environmental changes that they caused. Research history In 1759 Giovanni Arduino proposed that the geological strata of northern Italy could be divided into four succ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
