TY - JOUR
T1 - Perforación profunda en el lago de Chalco
T2 - Reporte técnico
AU - Lozano-García, Socorro
AU - Brown, Erik T.
AU - Ortega, Beatriz
AU - Caballero, Margarita
AU - Werne, Josef
AU - Fawcett, Peter J.
AU - Schwalb, Antje
AU - Valero-Garcés, Blas L.
AU - Schnurrenberger, Douglas
AU - O'Grady, Ryan
AU - Stockhecke, Mona
AU - Steinman, Byron
AU - Cabral-Cano, Enrique
AU - Caballero, Cecilia
AU - Sosa-Nájera, Susana
AU - Soler, Ana María
AU - Pérez, Liseth
AU - Noren, Anders
AU - Myrbo, Amy
AU - Bücker, Matthias
AU - Wattrus, Nigel
AU - Arciniega, Alejandra
AU - Wonik, Thomas
AU - Watt, Sebastian
AU - Kumar, Dervla
AU - Acosta, Carmen
AU - Martínez, Ivan
AU - Cossio, Rafael
AU - Ferland, Troy
AU - Vergara-Huerta, Filiberto
PY - 2017/6/15
Y1 - 2017/6/15
N2 - This paper presents a short description of the coring operations undertaken to recover the full lacustrine sedimentary sequence from Chalco. Geophysical techniques were used to determine the distribution and thickness of the sediments in order to select the drilling site. Resonance frequencies determined from H/V spectral ratios were used to determine an area where lake sediments reached 300 m thickness. Electromagnetic survey showed two changes in electric resistivity which were related to changes in sediment composition, the first from 100 to 120 m, related to an increase in volcanoclastic sediments and the second from 330 to 400 m related to the presence of a basaltic flows. Three wells were drilled with continuous recovery, reaching depths of 420 m in well A, 310 in B and 520 in C. Samples for geomicrobiological and metagenomics studies were collected during drilling operations. A total of 1152 m of core sediments were recovered reaching a maximum depth of 520 m. Recovery percentages were between 88 and 92 % in the three wells. Magnetic susceptibility analyses in the three sequences show that the first 260 m are mostly lake sediments, between 260 and 300 m sediments are coarser and below 300 m they are mostly volcaniclastic. Analysis of the sedimentary sequence of Lake Chalco that covers the last ~300000 years will allow documenting and extending the knowledge of climate variability in area, the paleoenvironmental history, basin closure history, lacustrian system development and volcanic activity recurrence. Studies of the physical properties of this sequence will be important for seismic propagation and basin structure modeling, and also will improve modeling of the subsidence process that this region experiences.
AB - This paper presents a short description of the coring operations undertaken to recover the full lacustrine sedimentary sequence from Chalco. Geophysical techniques were used to determine the distribution and thickness of the sediments in order to select the drilling site. Resonance frequencies determined from H/V spectral ratios were used to determine an area where lake sediments reached 300 m thickness. Electromagnetic survey showed two changes in electric resistivity which were related to changes in sediment composition, the first from 100 to 120 m, related to an increase in volcanoclastic sediments and the second from 330 to 400 m related to the presence of a basaltic flows. Three wells were drilled with continuous recovery, reaching depths of 420 m in well A, 310 in B and 520 in C. Samples for geomicrobiological and metagenomics studies were collected during drilling operations. A total of 1152 m of core sediments were recovered reaching a maximum depth of 520 m. Recovery percentages were between 88 and 92 % in the three wells. Magnetic susceptibility analyses in the three sequences show that the first 260 m are mostly lake sediments, between 260 and 300 m sediments are coarser and below 300 m they are mostly volcaniclastic. Analysis of the sedimentary sequence of Lake Chalco that covers the last ~300000 years will allow documenting and extending the knowledge of climate variability in area, the paleoenvironmental history, basin closure history, lacustrian system development and volcanic activity recurrence. Studies of the physical properties of this sequence will be important for seismic propagation and basin structure modeling, and also will improve modeling of the subsidence process that this region experiences.
KW - Basin of Mexico
KW - Chalco
KW - Lacustrian sediments
KW - Paleoclimate
KW - Volcanism
UR - http://www.scopus.com/inward/record.url?scp=85028953927&partnerID=8YFLogxK
U2 - 10.18268/BSGM2017v69n2a2
DO - 10.18268/BSGM2017v69n2a2
M3 - Article
AN - SCOPUS:85028953927
SN - 1405-3322
VL - 69
SP - 299
EP - 311
JO - Boletin de la Sociedad Geologica Mexicana
JF - Boletin de la Sociedad Geologica Mexicana
IS - 2
ER -