Geoscience Reference
In-Depth Information
(a)
(b)
(c)
mgal
(d)
Figure 10.49.
(a) A map of the regional Bouguer gravity field in central Australia.
\\\\, anomalies less negative than −20 mgal; ////, anomalies more negative than
−100 mgal. (b) The Bouguer gravity anomaly along line AB. (c) Predicted uplift of
(1) the central part of the Musgrave block and (2) the southern Arunta block; and
subsidence of (3) the southern Amadeus Basin, (4) the central Amadeus Basin,
(5) the northern Amadeus Basin and (6) the central Ngalia Basin. Note that, except
for the central Amadeus Basin, all subsidence and uplift rates have increased with
time. (d) The predicted cross section of the crust along line AB after the Alice
Springs orogeny (about 320 Ma). The original crust was assumed to be 30 km thick
and divided into 15-km-thick upper- and lower-crustal layers. (After Lambeck (1983).)
