Deformation phases in the central Schwarzburg anticline – relations to Variscan and pre-Variscan geodynamics (Saxo-Thuringia, Central European Variscides)
0
Citation
0
Reference
10
Related Paper
Keywords:
geodynamics
Anticline
Indicating the Role of Geological Conditions in Shaping the Hareer Anticline, Iraqi Kurdistan Region
The Hareer anticline is within the High Folded Zone, facing southwards towards the Low Folded Zone. Both zones are part of the Outer Platform of the Arabian Plate. Moreover, both zones are part of the Zagros Fold-Thrust Belt located within the Zagros Foreland Basin. Although the Hareer anticline is a double plunging anticline oriented in a NW-SE trend, both plunges are abnormal. The northwestern plunge is gradually passing to the southwestern limb of the Pirat anticline; although there is a very shallow syncline in between them, giving a right-hand en-echelon form to the plunge. Whereas, the southeastern plunge disappears between the Kamosk anticline located southeast wards and the Shakrook anticline is located southwards. Both the Hareer and the Kamosk anticlines are thrusted over the Shakrook anticline by means of two long thrust faults that run almost parallel to the Hareer anticline. It is clearly observed that the anticline is growing northwest wards; according to the recognized geomorphological and structural features. High-Quality satellite images were interpreted to elucidate the abnormal form of the Hareer anticline. The interpreted data and different types of geomorphological features including the estimation of the rate of stream incision were checked in the field.
Anticline
Syncline
Cite
Citations (3)
Thrust‐related anticlines exposed at the mountain front of the Cenozoic Appenninic thrust‐and‐fold belt share the presence of hinterlandward dipping extensional fault zones running parallel to the hosting anticlines. These fault zones downthrow the crests and the backlimbs with displacements lower than, but comparable to, the uplift of the hosting anticline. Contrasting information feeds a debate about the relative timing between thrust‐related folding and beginning of extensional faulting, since several extensional episodes, spanning from early Jurassic to Quaternary, are documented in the central and northern Apennines. Mesostructural data were collected in the frontal anticline of the Sibillini thrust sheet, the mountain front in the Umbria‐Marche sector of the northern Apennines, with the aim of fully constraining the stress history recorded in the deformed multilayer. Compressional structures developed during thrust propagation and fold growth, mostly locating in the fold limbs. Extensional elements striking about perpendicular to the shortening direction developed during two distinct episodes: before fold growth, when the area deformed by outer‐arc extension in the peripheral bulge, and during a late to post thrusting stage. Most of the the extensional deformation occurred during the second stage, when the syn‐thrusting erosional exhumation of the structures caused the development of pervasive longitudinal extensional fracturing in the crestal sector of the growing anticline, which anticipated the subsequent widespread Quaternary extensional tectonics.
Anticline
Extensional tectonics
Extensional fault
Thrust fault
Cite
Citations (48)
Anticline
Syncline
Cite
Citations (0)
The Azmir-Goizha anticline elongates directly to north and northeast boundary of Sulaimani city, Kurdistan Region, NE-Iraq. The anticline is originally consisted of two main connected anticlines (Goizha and Azmir anticlines) at southwest and northwest of the studied area respectively with many other smaller ones. The anticline has the length, width and elevation of about 10, 4 and 1.6 kms (amsl) respectively. It elongates from Weladar village, from southeast to Khamza village at the northwest. The anticline is relatively complex and during the last decade, many structural, paleontological and stratigraphical studies were conducted on it but without utilizing them for accurate solving complexity. The present study tries to use the field study and nannofossils aging for simplifying and showing actual geologic setting of the anticline. The previous occurrence of 63m of Dokan Formation and its unconformable lower boundary are refused. On the basis of clear stratigraphic horizon, the geological map of the anticline is completely changed and new stratigraphic units are shown. The map shows that the anticline is mainly covered by Balambo Formation instead of previous Kometan Formation. Moreover, the Sarmord Formation is identified for the first time in the area and differentiated from Balambo Formation. Sarmord Formation crops out and occupies the core of the anticline which can be seen from Khamza to Weladar villages at the northwest and southeast of the studied area respectively. For the first time, the equivalents of Gulneri and Dokan formations are shown and discussed in the area.
Anticline
Geologic map
Cite
Citations (12)
Anticline
Petroleum seep
Cold seep
Cite
Citations (26)
The Shakrook anticline has very a complicated structural form, this is attributed to three thrust faults, and the presence of four anticlinal axes with the main anticlinal body. The most northwest existing anticline is called in the current study the Sisawa anticline, the main two anticlines are called the Shakrook East and Shakrook West, whereas the fourth one is called the Biluk anticline it is developed along the southwestern limb of the Shakrook East anticline. The exposed rocks in the Shakrook anticline range from Upper Jurassic to the Paleogene age. The bulk of the main Shakrook anticline is formed by the Bekhme Formation (Upper Cretaceous age), whereas the bulk of the Sisawa anticline is formed of the Shiranish Formation (Upper Cretaceous age) with Paleogene and Neogene aged rocks. Geological maps and high-quality satellite images were used to elucidate the complex structural form of the Shakrook anticline. The updated geological map is quite different from those existing geological maps. A field investigation was carried out to check the interpreted data and to implement photography to the interested structural and geomorphological forms. Different geomorphological forms also were interpreted; they all refer to the lateral growth of the Shakrook anticline.
Anticline
Paleogene
Neogene
Geologic map
Cite
Citations (3)
The Bradost and Chinara mountains are two well-known geomorphic features in the Iraqi Kurdistan Region (IKR), forming two anticlines, besides Shireen and Sare Musa anticlines, which are located north of the Bradost anticline, all four anticlines trend NW - SE. The four anticlines are dissected by the Greater Zab River that swings along its course within the anticlines due to tens of very old landslides and/or plunges. The four studied anticlines are dissected by different thrust faults, which extend for a few kilometers. The thrust faults trend NW - SE; however, locally they deflect from the main trend. The Lower Jurassic rocks are the oldest exposed rocks in the studied area, whereas the rocks of the Bekhme Formation form the carapace of the Bradost and Chinara anticlines. Different structural and geomorphological features were interpreted from satellite images and those which are accessible were checked in the field, all of them indicate the four anticlines exhibit lateral growth. We have measured different aspects to elucidate the type of folds. The four anticlines are Detachment folds, with shallow decollement, which ranges in depth between (100-250) m.
Anticline
Cite
Citations (0)
The Tianshan is one of the largest and the most active intracontinental mountain ranges in the world. Ac-tive fold-and-thrust belts flank both sides of the mountain. This paper based on the data of seismic refection profiles, wells, remote sensing, detailed surface structural survey and magnetostrati graphy focuses on the Kuqa thrust system in the central part of the southern Tianshan. In the Kuqa River area, the 60 km wide fold-and-thrust belt is characterized by four east-west-trending folds. Near the mountain front, the Northern fold and the Keyi fold involve Mesozoic and Eogene strata and make two unconformities between the Meocene Jidike Formation and the Eogene Suweiyi Formation and in the Meocene Kangcun Formation. The unconformities im-ply that the beginning of deformation in the Kuqa thrust system is around Oligocene. Toward the Tarim basin, the more recent Miocene to Pleistocene sediment is folded along the Quilitake anticline. Further south, the Yaken anticline is involving the Holocene surface that is folded. The growth strata over the Yaken anticline and the Quilitake anticline are in the lower part of the Pliocene Kuqa Formation. Combining with the magne-tostratigraphic sections on the both sides of the Qiulitake anticline we suggest that the timing of deformation on the Yaken anticline and the Quilitake anticline is the early Pliocene (5. 5 ± 0. 2 Ma), and an average slip rate of 1. 5 mm/a since Pliocene is estimated on the Quilitake anticline.
Anticline
Thrust fault
Cite
Citations (29)