عنوان

A study of models and controls for basin formation during continental collision:

Number

TLpq304425520

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

A study of models and controls for basin formation during continental collision:

General Material Designation

[Thesis]

First Statement of Responsibility

K. Tandon

Title Proper by Another Author

(1) Australian lithosphere along Banda orogen (Indonesia) and (2) Alboran Sea basin (western Mediterranean)

Subsequent Statement of Responsibility

J. Lorenzo

Name of Publisher, Distributor, etc.

Louisiana State University and Agricultural & Mechanical College

Date of Publication, Distribution, etc.

1998

Specific Material Designation and Extent of Item

200

Dissertation or thesis details and type of degree

Ph.D.

Body granting the degree

Louisiana State University and Agricultural & Mechanical College

Text preceding or following the note

1998

Text of Note

Mechanisms for the formation of a foreland basin at the beginning of continental collision (Pliocene-Recent Australian continental foreland along the Banda orogen) and a post-orogenic, continental, Miocene extensional basin (Alboran Sea) are studied. Such a study investigates the controls on the basin formation during the start of the Wilson cycle and later during the break up of a thickened continent in a collisional environment. Effective Elastic Thickness (EET) of the Australian continental lithosphere from Roti to the Kai Plateau (usd{\sim}121\sp\circ{-}137\sp\circusdE longitude) are estimated using an elastic-half beam model to match the sea floor bathymetry and the Bouguer gravity anomalies. Range of constant EET values from 27-75 km across the shelf of Australian lithosphere shows a variation of 64% with the highest value in the vicinity of central Timor where the collision is most advanced. Downdip on the Australian continental lithosphere from shelf to beneath the Banda orogen, the reduction in EET is from 90 km-30 km (66%). Variations in EET can be explained by inelastic yielding (brittle and plastic failure, crust-mantle decoupling in the lower crust and brittle-ductile decoupling in the upper-middle crust) in the Australian lithosphere. Change in EET occurred at the start of continental subduction due to change in curvature, both in map and cross-sectional view. Oroclinal bending of the continental Australian lithosphere increased the inelastic failure in the eastern end. Different mechanisms of basin formation at a site of post-orogenic collapse are studied by constraining the timing of rifting in the western, eastern, and northern parts of the Alboran Sea basin on seismic reflectors via synthetic seismograms using ODP Leg 161 and Andalucia A-1 data. Regions of adjacent coeval compression and extension are found in the Alboran Sea basin. Normal faulting continues in parts of the eastern Alboran Sea basin later than in the western Alboran Sea basin. The development of the Alboran Sea basin is envisioned through a southeasterly migration of the delaminating continental lithosphere to explain younger extension in the eastern Alboran Sea basin. The rate of the migration of the delamination front is of the range of millimeters-centimeters/year.

Alboran Sea

Australian

Banda orogen

Basin formation

Continental collision

Earth sciences

J. Lorenzo

K. Tandon

Electronic name

p

[Thesis]

276903

a

Y