湖北省西南部地質構造形態,可以分別為華夏式與新華夏式。華夏式構造為本區主要構造形式,走向東北——西南。顯著的褶縐有十一個背斜(看附圖F_(2-4),F_6,F_8,F_(11),F_(13-15),F_(17),F_(21)),十二個向斜(F_1,F_5,F_7,F_(9-10),F_(11)F_(16),F_(19),F_(20-22),F_(26));還有九個逆掩斷層(T_(3-11))。褶縐形狀是寬而長,各軸向略呈平行,有向兩端延長達幾百公里的,有向一端延展的,或兩端傾消的。較新地層居向斜中部,較老地層居背軸軸部。向斜軸部地層傾斜平緩(傾角15°—30°),在兩翼傾斜較陡(傾角35°—70°),有時直立。至於逆掩斷層(T_(3-11)),斷層走向與褶縐走向相同,T_3(看附图)是最顯著的,向兩端延長达60公里,斷層面傾向西北,上衝體從西北向东南推動。其餘斷層延長較短,上衝體有從西北向東南,亦有從東南向西北推動,情况不一。新華夏式構造在本區內居次。褶縐走向北北东—南南西,成狭而長的形狀。向斜軸部地層傾斜較陡(傾角45°—80°),而在背斜軸部傾斜較緩。属於此系的逆掩斷層,T_1在齊嶽山之东麓,T_2在川利縣之西,T_9在咸豐縣之南,T_(11)及T_(12)都在F_(18)向斜西翼。斷層走向都是北北東-南南西,舆褶縐走向相同。 華夏式與新华夏式二系構造干涉現象異常顯著,如向斜(F_1)軸部被逆掩斷層(T_2)截割為二,背斜(F_(13))的西南段被逆掩斷層阻切,向斜與背斜原來都成東北—西南走向,被成北北東—南南西向的逆掩斷層所阻切。亦有褶縐受阻撓而折轉成北北東—南南西向,如F_7,F_8,F_(10);可以證明華夏式構造受新華夏式構造所阻切。 華夏式被新華夏式所截切或干涉,二者造山運動時期,自然前者較早,約在白堊纪的後期;後者較晚,在白堊紀之後,可能在第三紀初期。 The geological structure in the southwestern part of Hubei Province can be Huaxia style and Xinhua style respectively. The Huaxia-style structure is the main structure in this area, moving northeast-southwest. Significant pleats have eleven anticlines (see Figures F_ (2-4), F_6, F_8, F_ (11), F_ (13-15), F_ (17), F_ (21) (F_1, F_5, F_7, F_9-10, F_11, F_16, F_19, F_20-22, F_26); there are nine inverse masks Fault (T_ (3-11)). Pleated crepe shape is wide and long, the axis is slightly parallel to both ends of the extension of up to hundreds of kilometers, with one end of the extension, or both ends of the consumer. The newer strata lie in the middle of the syncline and the older strata reside in the backshaft axis. The syncline ramp slopes gently (dip angle 15 ° -30 °) and steeply tilts at both wings (dip angle 35 ° -70 °), sometimes upright. As for the overthrust (T_ (3-11)), the strike of the fault is the same as that of the crepe, and T_3 (see the figure) is the most prominent. It extends 60 km to both ends, and the fault plane tends to the northwest. To promote the southeast. The rest of the fault extension is shorter, the punching body from northwest to southeast, but also from southeast to northwest promote, the situation is different. Xinhua Xia structure in the district ranking. Pleated crevices toward north, east, south, west and west, into a narrow and long shape. The syncline axis is steeper (dip angle 45 ° -80 °) and slopes gently in the anticlinal axis. T_1 is located in the west of Chuanli County. T_9 is located in the south of Xianfeng County. Both T_ (11) and T_ (12) are on the west of F_ (18) syncline . The faults are all North-East-South-South-West faults with the same creel pattern. For example, the axial part of the syncline (F_1) is cut into two by the overthrust (T_2), and the southwest section of the anticline (F_ (13)) is overturned The shear, syncline and anticline all turned into northeast-southwest and were cut off by the overthrust of north-north-east-south-south-west direction. Some pleats were obstructed and turned into North-East-South-South-West, such as F_7, F_8 and F_ (10). It can be proved that the Huaxia structure was blocked by the Xinhua-Xia structure. The Cathaysia was cut or interfered by the Xinhua-Xia-style. During the orogenic movement, the former naturally occurred earlier, about later in the Cretaceous. Later, after the Cretaceous, it was probably in the early Tertiary.