U. Mass Lowell Prof. Nelson Eby Department of Environmental, Earth, & Atmospheric Sciences

Home

Courses

Research

Analytical Facilities

Publications

Field Trip Guides

Links
     

Archean and Paleoproterozoic Granitoids of the Carajás Metallogenic Province

 Eastern Amazonian Craton

IGCP-510, Belem, Brazil

A six day field trip (in conjunction with the IGCP-510 meeting in Belem, Brazil) to exposures of the Archean and Paleoproterozoic granitoids of the Carajás metallogenic province (CMP) and several associated ore deposits (Sossego copper mine and the iron mines of Companhia Vale do Rio Doce). The CMP can be divided into two major terranes - the Rio Maria granite-greenstone terrane and the Carajás basin. Seven groups of granitoids are distinguished in the CMP. Archean age granitoids - (1) older tonalite-trondhjemite series, (2) sanukitoid series (granodiorites and similar rocks), (3) younger tonalite-trondhjemite series, (4) potassic leucogranites of calc-alkaline affinity, (5) granitoids of the Plaquê suite, and (6) subalkaline foliated granites. Proterozoic age granitoids - (7) A-type granites (A2).

br22.jpg (231189 bytes) br24.jpg (223310 bytes) br28.jpg (227130 bytes) br38.jpg (209704 bytes)
Examining outcrops of the Arco Verde tonalite. Field trip leader, Roberto Dall'Agnol, in center of picture (Stop 2.1). The Marajoara granite (Stop 2.2). (l to r) Jaana Halla, Carlos Eduardo Barros de Mesquita (Cadu), Lêda Maria Barreto Fraga, Brent Elliot (Stop 2.3).  Mafic enclave in Rio Maria granodiorite (Stop 3.1).
br41.jpg (156924 bytes) br45.jpg (206013 bytes) br47.jpg (212164 bytes) br51.jpg (222282 bytes)
An attractive, but unidentified, seed pod (Stop 3.3). Scenic vista (Stop 3.5). Basaltic pillow lavas of the Andorinhas supergroup (Stop 4.1). Tonalitic rocks intruded by a sub-horizontal ~4 m thick layer of pegmatitic leucogranite (Stop 4.3). 
br52.jpg (219070 bytes) br53.jpg (226297 bytes) br56.jpg (228012 bytes) br57.jpg (226344 bytes)
Banded and deformed trondhjemite (Stop 4.3). Tack-board discussion (Stop 4.3). Karen Volp and Tapani Ramo (Stop 4.3). Bob Martin, Karin Volp, Jaana Halla, Tony Mariano, Alberto Lobo-Guerrero Sanz (l to r) examining outcrop of leucomonzogranite, Xinguara granite (Stop 4.4).
br58.jpg (198947 bytes) br59.jpg (215733 bytes) br61.jpg (214329 bytes) br62.jpg (210193 bytes)
Tapani Ramo delivering the gospel on Rapakivi granites (Stop 4.4). Água Fria trondhjemite (Stop 4.5). Foliated and deformed leucomonzogranites with tonalite enclave (Stop 4.5). Field trip bus in front of hotel. Canaã dos Carajás.
br63.jpg (197438 bytes) br64.jpg (203944 bytes) br65.jpg (203440 bytes) br66.jpg (219564 bytes)
Horse drawn cart. Canaã dos Carajás. Main street. Canaã dos Carajás. Geological lecture by Cadu (Stop 5.1).  Foliated biotite leucomonzogranite (Stop 5.1).
br67.jpg (218814 bytes) br68.jpg (215168 bytes) br69.jpg (109155 bytes) br70.jpg (102848 bytes)
Scenic vista. Planalto pluton (Stop 5.2). Biotite-hornblende monzogranite of the Planalto pluton (Stop 5.2). Plan of the Sossego mine. Geologic map of Sossego mine area.
br72.jpg (226067 bytes) br73.jpg (82487 bytes) br74.jpg (88713 bytes) br75.jpg (194304 bytes)
Map of Sossego mine ore bodies. Map of Sossego mine ore bodies. Reserve and production data. Sossego mine. Ore transport system. Sossego mine.
br76.jpg (175407 bytes) br77.jpg (193135 bytes) br78.jpg (204920 bytes) br79.jpg (206818 bytes)
Ore processing plant. Sossego mine. Sossego mine. Drilling blast holes. Sossego mine. Shovel at work. Sossego mine.
br80.jpg (198282 bytes) br81.jpg (196119 bytes) br82.jpg (190257 bytes) br83.jpg (173642 bytes)
Now that's ore grade material! Sossego mine. Crusher. Sossego mine. Beneficiation. Sossego mine. Location of CVRD mines and support facilities.
br85.jpg (96089 bytes) br93.jpg (134069 bytes) br87.jpg (205806 bytes) br88.jpg (202144 bytes)
Distribution of Carajás iron ore. Map of CVRD iron mines. CVRD iron mine. CVRD iron mine. 
br89.jpg (209662 bytes) br90.jpg (204098 bytes) br91.jpg (190301 bytes) br92.jpg (117455 bytes)
CVRD iron mine. CVRD iron mine. Bob Martin. CVRD iron mine. Michael Bennell. CVRD iron mine.
eby2.jpg (77784 bytes) br94.jpg (216781 bytes) br96.jpg (146637 bytes) br97.jpg (205269 bytes)
Tapani Ramo, Nelson Eby, and Brent Elliot getting ready for a game of polo. CVRD iron mine. (photo by Karen Volp). Hornblende-bearing pegmatite dike (Stop 6.3). Hornblende syenogranite (Stop 6.3). The creek (Stop 6.3).
br98.jpg (165523 bytes) br99.jpg (135010 bytes) br100.jpg (220667 bytes)  
Crossing the creek the exciting way (Stop 6.3). Crossing the creek the easy way (Stop 6.3). The women geologists - (l to r) Karen Volp, Jaana Halla, Lêda Maria Barreto Fraga, Maria do Carmo Pintal Gastal, Maria de Lourdes da Silva Rosa (Stop 6.3).  

Return to Field Excursion Photos

Top of page.