A possible buried Paleoproterozoic collisional orogen beneath central South China: Evidence from seismic-reflection profiling

Dong, Shuwen; Zhang, Y.Q.; Gao, Rui; Su, Jinbao; Liu, M.; Li, J.H.

doi:10.1016/j.precamres.2015.04.003

Cited by 110 publications

(50 citation statements)

References 62 publications

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“…The Jiangnan Orogen, as an east‐north‐east trending orogenic collage in central south China (Figure ), was developed by protracted oceanic subduction, closure, and collision/amalgamation of island terranes between the Yangtze and Cathaysia Blocks during the Proterozoic [e.g., Guo et al ., ; Dong et al ., ; Zhao , ; X. L. Wang et al ., ]. The orogen is bounded to the south by the Shaoxing‐Jiangshan‐Pingxiang suture zone (SJPSZ) and covered to the north by Phanerozoic sedimentary rocks (Figure ).…”

Section: Geological Overview Of the Jiangnan Orogenmentioning

confidence: 99%

“…Notably, an angular unconformity outcrops extensively throughout the orogen, which separates the above rock sequences into two packages with contrasting structural styles. Rock sequences below the unconformity (>820 Ma) display tight linear, isoclinal, and overturned folds, thrusts, and penetrative cleavages, whereas those above the unconformity (<820 Ma) are flat‐lying and exhibit open folds with rare cleavage development (e.g., SW [ Dong et al ., ; X. L. Wang et al , ]). The ~820 Ma flysch turbidites above the unconformity were the earliest continental rift deposits that marked the initial opening and rifting of the Nanhua Rift potentially related to the arrival of an ~825 Ma mantle plume [ Li et al ., ; Wang and Li , ].…”

Section: Geological Overview Of the Jiangnan Orogenmentioning

confidence: 99%

“…The recent finding of a buried Paleoproterozoic orogen beneath the western Jiangnan Orogen, identified using seismic reflection profiling, led Dong et al . [] to predict the amalgamation of the two blocks in the Paleoproterozoic, associated with the assembling of the Colombian supercontinent.…”

Section: Geological Overview Of the Jiangnan Orogenmentioning

confidence: 99%

“…It is separated from North China by the Qinling‐Dabie orogen and consists of the Yangtze and Cathaysia Blocks (Figure ). These two crustal blocks are traditionally interpreted to have amalgamated during a Proterozoic collision [e.g., Chen et al ., ; Shu et al ., , Shu and Charvet , ; Charvet et al ., ; Li et al ., , ; X. L. Wang et al , ; Dong et al ., ]. The Phanerozoic tectonic evolution of south China is characterized by three discrete orogenic cycles including early Paleozoic, Triassic, and Jurassic‐Cretaceous orogenies, respectively [e.g., Lin et al ., ; Wang et al ., ; G. W. Zhang et al , ].…”

Section: Introductionmentioning

confidence: 99%

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New insights into Phanerozoic tectonics of south China: Part 1, polyphase deformation in the Jiuling and Lianyunshan domains of the central Jiangnan Orogen

et al. 2016

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The central Jiangnan Orogen, genetically formed by the Proterozoic Yangtze‐Cathaysia collision, presents as a composite structural feature in the Phanerozoic with multiple ductile and brittle fabrics whose geometries, kinematics, and ages are crucial to decipher the tectonic evolution of south China. New structural observations coupled with thermochronological and geochronological studies of these fabrics document four main stages of deformation. The earliest stage in early Paleozoic time (460–420 Ma) corresponds to combined E‐trending dextral and northwest directed thrust shearing that was variably partitioned in anastomosing high‐strain zones under greenschist‐facies conditions (~400–500°C), related to the continued Yangtze‐Cathaysia convergence externally driven by the suturing of south China with Australia. This event was heterogeneously overprinted by the second stage characterized by ~E‐oriented folding in middle Triassic time, geodynamically resulting from the continental collision of south China with Indochina and North China. The third stage was locally developed by northwest and southeast vergent thrusts that truncated ~E‐oriented folds in the Late Jurassic, due to northwestward subduction of the Paleo‐Pacific plate. The latest stage involved normal faulting and tectonic unroofing in Cretaceous time, which resulted in basin opening and reset footwall 40Ar/39Ar ages in proximity to the Hengshan detachment fault, associated with roll‐back of the subducting Paleo‐Pacific plate.

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Section: Geological Overview Of the Jiangnan Orogenmentioning

confidence: 99%

Section: Geological Overview Of the Jiangnan Orogenmentioning

confidence: 99%

Section: Geological Overview Of the Jiangnan Orogenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

New insights into Phanerozoic tectonics of south China: Part 1, polyphase deformation in the Jiuling and Lianyunshan domains of the central Jiangnan Orogen

et al. 2016

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“…(a and b) Deformational phase one, (d and f) phase two, and (g) phase three in Models 1-3. (c and e) Seismic profiles with corresponded structural styles in the kinematic model and locations in Figure 2a and the insert in Figure 2 of tectonics outline of the South China (modified fromYan et al, 2003a, 2009and Dong et al [2015; see text for discussion).…”

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confidence: 99%

Fault‐related fold styles and progressions in fold‐thrust belts: Insights from sandbox modeling

et al. 2016

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Fault‐related folds of variable structural styles and assemblages commonly coexist in orogenic belts with competent‐incompetent interlayered sequences. Despite their commonality, the kinematic evolution of these structural styles and assemblages are often loosely constrained because multiple solutions exist in their structural progression during tectonic restoration. We use a sandbox modeling instrument with a particle image velocimetry monitor to test four designed sandbox models with multilayer competent‐incompetent materials. Test results reveal that decollement folds initiate along selected incompetent layers with decreasing velocity difference and constant vorticity difference between the hanging wall and footwall of the initial fault tips. The decollement folds are progressively converted to fault‐propagation folds and fault‐bend folds through development of fault ramps breaking across competent layers and are followed by propagation into fault flats within an upper incompetent layer. Thick‐skinned thrust is produced by initiating a decollement fault within the metamorphic basement. Progressive thrusting and uplifting of the thick‐skinned thrust trigger initiation of the uppermost incompetent decollement with formation of a decollement fold and subsequent converting to fault‐propagation and fault‐bend folds, which combine together to form imbricate thrust. Breakouts at the base of the early formed fault ramps along the lowest incompetent layers, which may correspond to basement‐cover contacts, domes the upmost decollement and imbricate thrusts to form passive roof duplexes and constitute the thin‐skinned thrust belt. Structural styles and assemblages in each of tectonic stages are similar to that in the representative orogenic belts in the South China, Southern Appalachians, and Alpine orogenic belts.

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New insights into Phanerozoic tectonics of South China: Early Paleozoic sinistral and Triassic dextral transpression in the east Wuyishan and Chencai domains, NE Cathaysia

Zhang

Zhao

et al. 2017

Tectonics

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The northeast Cathaysia area is characterized by an archetypical, transpressional system with widespread strike‐slip shear zones whose geometries, kinematics, and ages are critical for deciphering the Phanerozoic tectonic evolution of South China. We present new structural, geochronological and thermochronological data from the shear zones in the east Wuyishan and Chencai domains, which record two phases of deformation. The first phase corresponds to sinistral oblique shearing along arrays of NNE oriented, steep‐dipping zones under amphibolite facies conditions. The sinistral oblique shearing commenced at ~451 Ma, concurrently with regional NW/SE directed thrust shearing and folding; the coexistence of sinistral and thrust structures indicates NW‐SE transpressive shortening deformation. Dating by 40Ar/39Ar shows that such deformation terminated before 400 Ma and was followed by cooling through ~450–350°C at ~400–370 Ma. Our results, merged with published data, aid in tracing an Early Paleozoic orogen that extends through the Jiangnan domain into the northeast Cathaysia, with the southeast Yangtze acting as a foreland belt. The synorogenic shortening was interpreted as resulting from underthrusting of the Cathaysia beneath the east Yangtze. The second phase involved dextral oblique shearing associated with NNE‐SSW transpression under greenschist to amphibolite facies conditions at 245–228 Ma, which was followed by postkinematic magmatism and cooling at ~221–200 Ma. In the Cathaysia, similar Middle Triassic dextral shear zones were widespread and operated with approximately east striking thrusts as mutually complementary structures; their kinematic coupling can be explained by a contractional termination model. Geodynamically, we attributed Middle Triassic dextral transpression to the collisions of South China with North China and Indochina.

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A possible buried Paleoproterozoic collisional orogen beneath central South China: Evidence from seismic-reflection profiling

Cited by 110 publications

References 62 publications

New insights into Phanerozoic tectonics of south China: Part 1, polyphase deformation in the Jiuling and Lianyunshan domains of the central Jiangnan Orogen

New insights into Phanerozoic tectonics of south China: Part 1, polyphase deformation in the Jiuling and Lianyunshan domains of the central Jiangnan Orogen

Fault‐related fold styles and progressions in fold‐thrust belts: Insights from sandbox modeling

New insights into Phanerozoic tectonics of South China: Early Paleozoic sinistral and Triassic dextral transpression in the east Wuyishan and Chencai domains, NE Cathaysia

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