Page 629 - Economia Azul - versão: inglês

Figure 1y
º
º
50 0'0"W 45 0 ' 0 "W

z
b
b
o
LO

Legend
• IODP _ 155

Figure X3: Discoveries of the occurrence PROJECT*) and Rio Grande Cone, Pelotas
of GH in Brazilian territory: Amazon Basin (CONEGAS Project*) *Projects de-
'=D
Fan, Foz do Amazonas Basin (TUCUXI veloped by IPR/PUCRS. o o o ' o
Source: Adapted from Ketzer et al., (2021). 100 200
km
The Foz do Amazonas Deep-sea Fan Gas Hydrates Province
The Foz do Amazonas Cone is approxi- about the sediments deposited there were
mately 250 km from the mouth of the Am- cored and profiled (FLOOD et al., 1995). - 3 0 0 0
azon River. This sedimentary Fan extends The movement of this thick sequence of -2800
for 700 km seaward, from the outer edge sediments, predominantly composed of mass
of the continental shelf to water depths wasting and turbidite deposits (channel-le-
of more than 4,000 m in the Demerara vee), caused the gravitational collapse of the
Abyssal Plain (Fig. 1y). It occupies an area region, resulting in the establishment of ex-
of 330,000 Km² and 9 km of sedimentary tensional dynamics in the proximal part and

thickness (SILVA et al., 1999; DAMUTH and compressive in the distal part, with the conse-
KUMAR, 1975). This feature began its for- quent formation of normal faulting and fold-
•
mation in the Lower Miocene, through the ing systems, responsible for the formation of * Gas Plums
accumulation of sediments whose source gaps of up to 500 m in the seabed (FLOOD Gas Hidrates
area is attributed to the uplift of the Andes et al., 1991; REIS et al., 2010, 2016; SILVA et 10km 10 km
Mountains and the consequent reversal of al., 2016). The triggering of giant mass wast- 1.00
the direction of the Amazon River to the ing events (BTMs) has been associated with
northeast (FIGUEIREDO et al., 2009). The variations caused by climate during sea level � 2.00
1-
IODP mission #155 made important contri- changes (MASLIN et al., 2005). More recent- 3.00
butions to the knowledge concerning the ly, during the Neogene, BTMs are associated
tectono-sedimentary evolution of this area. with tectonic activity within the upper part of 4.00
17 wells with up to 450 m of information the slope (REIS et al., 2016). Source: Modified from Ketzer et. al., (2018).

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626 BLUE ECONOMY State of the Art of Gas Hydrate Occurrences 627