Geology of the Late Miocene
at Cerro Los Quesos, Ica Desert, Peru
Pisco Formation
Di Celma C. , (1)
(3, 4) (1) (1) (3) (3) (3) (3)
Gariboldi K. , Rustichelli A. , Pierantoni P.P. , Landini W. , Tinelli C. , Collareta A. , Bianucci G.
(2) (1) (3) (2) (2)
Malinverno E. , Cantalamessa G. , Gioncada A. , Bosio G. , Villa I.M. ,
(1) Scuola di Scienze e Tecnologie, Università di Camerino, Camerino, Italy
(2) Dipartimento di Scienze dell'Ambiente e del Territorio e di Scienze della Terra, Università di Milano-Bicocca, Milan, Italy (3) Dipartimento di Scienze della Terra, Università di Pisa, Pisa, Italy
(4) Dottorato Regionale in Scienze della Terra Pegaso, Pisa, Italy
LIMA
82° 78° 74° 70°
82° 78° 74° 70°
0°
4°
8°
12°
16°
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8°
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16°
Ica Region
PERU
Ecuador
Chile
Brazil Colombia
c P a
ific O
ce a n B o
liv ia
Ica Pisco
Ocucaje
76°00’
Study area
P a cif O
ce a n ic
0 25 km
14°00’
14°30’
76°00’
14°00’
14°30’
55 6 0
00 650
7
720 710 00 690 680 670660
64063 00 62 610
590 580 570 560
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MB0 top giallo
Cóndor
Alcatraz Estrella
Araña Espiral
Contour interval: 10 m
0 500 1000 1500 2000 m
metres
Normal faults. Rectangles on downthrown block
Bedding strike and dip
Symbols
8°
1:10,000 Scale
Aeolian deposits (thicker than 1 m).
Pisco formation (late Miocene-Pliocene) Quaternary deposits
Cóndor Estrella
Araña Espiral
Colibrí Ballena Árbol
Member B Member C Member D Member E Member F
T21
T12 T28 T34 T1
BP MB2 MB3 MB4 MB5 MB6
BG MB1
Flor
Árbol Lagarto
Colibrí Pelícano Mono Pájaro Perro
Manos
Ballena
Flor Pelícano Mono Pájaro Perro
Manos Lagarto
A A’ Trace of the cross section
Member B is about 51 m thick and it is made up of a monotonous succession of finely laminated white diatomites interbedded with sparse to locally abundant nodules, volcanic ash layers, and dolomite-cemented beds.
Member C is 53 m thick and consists of an alternation of three fine-grained pale gray sandstone packages, ranging in thickness between 4 and 12 m, with two packages of finely laminated white diatomites of varying thickness.
Member D is about 46 m thick and is made up of a monotonous succession of finely laminated white diatomites interbedded with sparse nodules, volcanic ash layers, and dolomite-cemented beds.
Member E is 22 m thick and consists of finely laminated white diatomites characterized by the occurrence of a high density of large, more or less regular discoidal or egg-shaped small nodules and highly irregular large nodules.
Member F is 75 m thick and composed of a monotonous succession of finely laminated white diatomites interbedded with sparse nodules, volcanic ash layers, and dolomite-cemented beds.
10°
2°
0°
5°
2× vertically exaggerated dip angle
Member A exceeds 45 m in thickness and its primary components include highly bioturbated, grey and yellow fine-grained sandstones with two sandy coquina beds and finely laminated white diatomites with sparse nodules.
Alcatraz
Member A
The San
plutons intruding pre-Mesozoic rocks. Compositional variations within the batholith include monzogranite in the centre passing outwards to granodiorite and diorite.
Nicolás Batholith comprises a group of disconnected yet apparently related
San Nicolás Batholith (early Paleozoic)
© Journal of Maps, 2015
T21
T12 T28 T34 T1
BP MB2 MB3 MB4 MB5 MB6
BG MB1 MB0 top giallo
Flor
Árbol Lagarto
Cóndor Colibrí Pelícano Mono
Alcatraz Estrella Pájaro
Araña Perro
Manos
Espiral
Ballena 700
600
500
C C’
A’-A” section
Vertical exaggeration 2×
E le v a ti o n a .s .l . (m )
700
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E le v a ti o n a .s .l . (m )
B
A’-A” section
Vertical exaggeration 2×
B’
A”
700
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A A’
B-B’ section
C-C’ section
Vertical exaggeration 2×
E le v a ti o n a .s .l . (m )
B’
A”
A
C C’
B A’
4°
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14°31’00’’
14°30’00’’
14°31’00’’
75°43’00’’
14°32’00’’ 14°32’00’’
75°44’00’’
75°43’00’’
75°44’00’’
14°30’00’’
14°29’08’’ 14°29’08’’
75°42’18’’
75°42’18’’
75°42’42’’
75°44’24’’
75°44’42’’
75°44’42’’
North
14°30’10’’ 14°30’10’’
FUNDING: research supported by a grant of the Italian Ministero dell’Istruzione dell’Università e della Ricerca
(PRIN Project 2012YJSBMK) and by National Geographic Society Committee for Research Exploration Grants (9410-13)
