Jaime L. B. Presser

JP Explorations

The initial data of XRD batch analysis in the transmission mode of three selected Capiibary diamond crystals are presented to support the Raman spectroscopy analyses which concluded that these diamonds would be lonsdaleite diamonds. Capiibary diamonds like lonsdaleite display the characteristic XRD ‘trident’ peak between 40° and 50° (111) 2-theta d...

Very probable lonsdaleitic diamond bearing a pitcher-shaped metal piece weighing approximately 303 kg. published Raman spectra we revisited. The Raman spectra of diamond characteristically show 3 intense bands: I- D-band with shifted peaks wavenumber (1294 to 1330 cm-1) I.e., diamond crystals that have lonsdaleitic component nature. II- G-band (wit...

• MAPCIS is a very probable peak ring type impact basin slightly oval in the E-W direction whose minimum reference size is 300/350 km in radius. MAPCIS is lo-cated in the center, slightly to W of Central Australia. On the southern flank of the MAPCIS is the exposed Musgrave Block; an area with abundant pseudotachy-lytes breccia. The present study e...

In recent work, JONATHAN T. WILLMAN et al. (PHYSICAL REVIEW B 106, L180101 (2022)) write Time progression of polycrystalline sample melting at 600 GPa and 7750K. The sample is initially composed of crystalline diamond regions (blue) separated by grain boundaries (light blue). Liquid regions (red) emerge at the grain boundaries, grow in size, and ev...

The work of Ovsyuk et al. shows an increase in the full widths at half maximums (FWHM) of the Raman spectra as afunction of the lonsdaleite content.

Briefly, it is assumed that diamonds formed in the stability field of the upper mantle/transition zone when being dragged (slab process) from the lower mantle by a solid-solid transformation process, at least in part, would lose stability passing to a heterogeneous crystalline phase: lonsdaleitic diamond.

Musgrave province of Central Australia illustrates a wide zone (~5 km) of pseudotachylite breccia intermittently for 300 km with up to 10% veining. The hanging wall of Woodroffe Thrust is characterized with over a hundred meters sheared pseudotachylites and overprinted by undeformed injection veins. The veins are measured on the ground in width fro...

The diamond in Paraguay was reported for the first time in 1825, and around 1960 the first artisanal exploitation was carried out in the city of Capiibary, Department of San Pedro. The first scientific analysis of Capiibary diamonds was conducted in 2012. A set of millimeter sized new crystals from cratonic lamproite colluvium with higher abundance...

The diamond in Paraguay was reported for the first time in 1825, and around 1960 the first artisanal exploitation was carried out in the city of Capiibary, Department of San Pedro, Eastern Paraguay. The first scientific analysis of Capiibary diamonds was conducted in 2012. A set of millimeter-sized new crystals of Capiibary diamonds from cratonic l...

The eclogitic cratonic geotherm was defined through 1D Vs for Puentesiño-Estancia Trementina lamproite pipes area (Dpto. Concepción, Paraguay) that oscillates around ~48 mW/m2 surface heat flows (enclosed in the 45 mW/m2 band of influence and crossing the diamond-graphite phase boundary at 135 Km of depth). Geotherm which is compared to those found...

We are delineating with geophysics, between Paraguay, Argentina, Uruguay, and Brazil, the edges of the Rio de la Plata SCLM Archon Craton. For the geophysics constraint we focused on the published data of S-wave (% dVs TX2011 3-D a global mantle shear-wave tomography model) that is complemented with the published P-wave (% dVp continental, SAM5_P_2...

Unfortunately, a version submitted for publication, where the editorial commission would not have complied with due process. It is the version for peer review and therefore without editing by the author.

Diamonds-bearing lamproites pipes associated with gold-rich mineralization (Paso Yobai-type)

The energies of explosives vs meteorite impact are given.

At the Rio de la Plata Craton archon-core environment were inferred, based on 1D Vs profiles (on 208 numbers of points), of the peridotitic geotherms. Values for the archon-core environment, it was estimated 38.5 to 40 mW/m2 in its central northern portion and southern portion and in its edges/southern portion 40 to 42 mW/m2. Geotherm values that a...

Panoramic map of the offshore Free Air GRAVITY anomalies of the Southern extreme of South America. Note the 250 km. wide NEGATIVE ANOMALY with a rougly circular ring of POSITIVE values located offshore to the NW of Gran Malvina-West Falkland island. That is the site of the "Late Permian (?) complex sedmentary basin" that could be a complex very lar...

A VERY IMPRESSIVE map of Free Air GRAVITY anomalies of the MALVINAS=FALKLANDS area is presented here. Note the 250 km. wide NEGATIVE ANOMALY located offshore to the NW of Gran Malvina=West Falkland island. That is the "Late Permian (?) complex sedimentary basin controlled by thrusts" that could be a complex large impact basin structure. There is no...

Map of Free Air GRAVITY anomalies of the MALVINAS=FALKLANDS area. Note the 250 km. wide NEGATIVE ANOMALY located offshore to the NW of Gran Malvina-West Falkland island. That is the "Late Permian (?) basin" that could be an impact structure. There is no visible submarine topographic expression of this "basin" in the maps of the surface of the ocea...

Map of Bouguer GRAVITY anomalies of the MALVINAS=FALKLANDS area. Note the 250 km. wide NEGATIVE ANOMALY with a rougly circular ring of POSITIVE values located offshore to the NW of Gran Malvina-West Falkland island. That is the site of the "Late Permian (?) complex sedmentary basin" that could be a complex very large impact basin. This basin is als...

submarine topographic map of the whole offshore area of the Malvinas-Falklands islands plateau is given. Note that there is no submarine surficial expression of the "Late Paleozoic complex sedimentary basin controlled by thrusts " located to the NW of Gran Malvina island = West Falkland island. The giant possible Late Permian (?) complex giant mete...

A basic map of the submarine offshore geology of the MALVINAS=FALKLANDS entire area is given. Note in yellow the 250 km. wide Permian basin located offshore to the NW of Gran Malvina-West Falkland island. That is the site of the " Late Permian (?) complex sedmentary basin controlled by thrusts" that could be a complex very large impact basin. This...

Another version of the basic regional map of the submarine offshore geology of the MALVINAS=FALKLANDS entire area is given. Note in yellow the 250 km. wide Permian basin located offshore to the NW of Gran Malvina-West Falkland island. That is the site of the " Late Permian (?) complex sedmentary basin controlled by thrusts" that could be a complex...

A panoramic map of the offshore magnetic anomalies of the Western South Atlantic Ocean is presented. Again, the Malvinas-Falklands 250 kilometers wide rose-like positive magnetic anomaly ( here showed in violet) located offshore to the NW of Gran Malvina = West Falkland Island is clearly visible. No similar 250 km-wide large rose-like magnetic anom...

Another version of the map of the Malvinas-Falklands 250 kilometers wide rose-like positive magnetic anomaly located offshore to the NW of Gran Malvina - West Falkland Island is showed. The positive magnetic anomaly reaches values up to 214 NanoTeslas. No similar large rose-like magnetic anomaly is visible in the whole South Atlantic Ocean. This ma...

The map of the Malvinas-Falklands 250 kilometers wide rose-like positive magnetic anomaly located offshore to the NW of Gran Malvina - West Falkland Island is showed. Red color spots represent very positive magnetic anomaly values up to 214 NanoTeslas. No similar large rose-like magnetic anomaly is visible in the whole South Atlantic Ocean. This m...

Around 70 km SSE of Chovoreca Hill (Paraguay), a pitcher-like metal piece weighing approximately 303 kg was found. Several studies have been carried out on this piece. Metallographic examination resembles cast iron that presents eutectoid microtextures, but the metal showed Neumann lines. Small fragments of the piece were diluted in concentrated HC...

The very impressive Malvinas-Falklands 250 kilometers wide rose-like positive magnetic anomaly located to the NW of Gran Malvina - West Falkland Island is showed. No similar large positive magnetic anomaly is visible in magnetic maps of the whole South Atlantic Ocean. This magnetic anomaly is located in the same place of a Late Paleozoic "complex s...

Bunder diamond-bearing lamproite cluster, located in Madhya Pradesh, India, was discovered in 2004. The Precambrian lamproites are intruding Paleoproterozoic and Mesoproterozoic intracratonic sedimentary rocks covering the Archean Bundelkhand craton. The study of Bundelkhand craton through global dVs% TX2011 model (1D and 2D) led us to recognize th...

The so-called rift/graben of Asunción was formed in the central-northern portion of the Archon lithospheric nucleus of the Rio de la Plata craton. This structure, related to a crustal thinning, likely resulted from an extraterrestrial impact which produced the San Miguel impact crater. The impact structure is located immediately to the south of the...

In 1992 Rampino noticed a large, almost circular negative gravity anomaly (~30 mGal) on the Falkland Plateau to the WNW of Malvinas Islands/Falklnad Islands using satellite data then available, and speculated that it might be associated with a large (~250 km wide?) buried impact structure. In some more recent compilations Rocca & Presser (2015) and...

Resultados de la caracterizacion de los Fitoplancton realizados en el marco del proyecto "Caracterización de los Recursos Hídricos para la Gestión de la Protección de la Biósfera del Bosque del Mbaracayu (Departamento Canindeyú) y de la Reserva Natural de Tapytá (Departamento de Caazapá) Paraguay" PROGRAMA PROCIENCIA -CONVOCATORIA 2013 -PROYECTO 1...

Se presentan un resumen de la Investigacion realizada en el marco del PROGRAMA PROCIENCIA -CONVOCATORIA 2013 -PROYECTO 14-INV-197. Estos resultados constituyen un aporte para la gestión ambiental y un punto de partida para investigaciones encaminadas a la protección de los recursos hídricos contra la contaminación por plaguicidas y demás sustancias...

The petrographic, mineralogical and rock chemistry criteria adequately support, a priori, a certification that the X kg metallic piece (Met Blas) found in the Chaco about 70 km to the SSE of the Chovoreca hill (Department of Alto Paraguay) by the rancher Justo López, and broken down here, it is a metallic meteorite (hexahedrite with abundant graphi...

Paraguay, Diamond Deposits Exploration Event Asuncion Hall of the Guaraní Hotel Street Oliva, Independence Nacional Corner Presentations: First part: 8:30-12:00 hs Dr. Konstantin Garanin (Chief Geologist, PJSC ALROSA) – PJSC ALROSA – Top Diamond Producer . Prof. Dr. Viktor Garanin (Chief Research Officer of Scientific-Research Geological Enterprise...

The hydrogeological map of SAYTT in Paraguay was made within the framework of the Cuenca del Plata Project, to bee integrated into the Regional Map (SAYTT of Argentina, Bolivia and Paraguay). Its elaboration is basd on the evaluation of publicatios and investigatios with historical information of wells, maps, physicochemical and isotopic analysis a...

MAPCIS is a marine oblique impact hitting the Centralian Superbasin over thick continental crust with a northeast to the southwest trajectory centered at 25°32'55.66"S 131°23'21.50"E with initial contact about 140 km to the northeast creating an approximately 600km diameter complex peak ring crater with bilateral symmetries, uprange-downrange compo...

Lamproites were found in the ultrapotassic Guaira-Paraguari Province, 80 km SE from the capital city of Asuncion (south Central Paraguay). This region constitutes the western portion of the intracratonic Parana Basin and was affected by potassic to ultrapotassic mag-matism of mesozoic age (~ 133 My), occuring mainly within the so-called Asuncion ri...

Se presentan 4 lineas de perfiles sísmicos 2D (1993/1994 Geco-Prakla) que cortan el flanco S del anillo en forma de picos y parte de la cuenca central en la interpretada probable Cuenca de Impacto Malvinas. Perfiles que se muestran sin “maquillajes” o distorsiones que permitan asi al lector formar una vision no pre-digerida y la compare con la indi...

La configuración gravimétrica modelada en la probable estructura de impacto Malvinas parecía, más propiamente, caracterizar el anillo en forma de picos (peak ring) descomunal (Fig. 1 a 5). Necesariamente el peak ring debía definir una cresta (rim crest) el doble de su tamaño –como bien estimado en cráteres de impacto gigantes de la Luna, de Marte,...

Como previamente comentado, modelar una estructura de impacto (de asteroides o cometas), diferente de la corrientemente mostradas a través de bien detallados valores de altitud obtenidos para la Luna (LOLA), Marte (MOLA), etc.; también puede ser obtenido a través de datos gravimétricos de satélite de: isostasia, de free air e incluso de Bouguer (Pr...

Modelar una estructura de impacto (de asteroides o cometas), diferente de la corrientemente mostradas a través de bien detallados valores de altitud obtenidos para la Luna (LOLA), Fig. 1, Marte (MOLA), etc.; también puede ser obtenido a través de datos gravimétricos de satélite de: isostasia, de free air e incluso de Bouguer (Presser, 2014; 2016a;...

Developing paleontology, gold mining in the town of Paso Yobai and diamonds exploration in progress, all in Paraguay, are commented on in this presentation. At the approach, each of them was focused by three technicians of different disciplines. This produces ethical sense in common but with diverse feelings.

We present some petrographic and cathodoluminescence evidences of impact metamorphism (PFs, PDFs, diaplectic quartz, zircons with low to strong impacted signatures and clasts of impact melt rock/plus inferred impact diamond) found in sandstone, concentrate heavy mineral (of soil and devastated lamproitic rocks) and breccia that occurs in the interi...

Around 2015 an indigenous person from the community settled in the surroundings of Cerro León, (Defensores del Chaco National Park) would have found a block of bronze colored metal rock of approximately 5.7 Kg. Rocky pieces that was recently acquired by Mr. Cándido Zaracho Garcete. The study of this metallic piece of metallic sulfide ore appearance...

In the modeled Tapytá impact crater (1) a microscopic introductory examination of the impact breccia (totally weathered)(2) exposed in the Private Nature Reserve Yapytá -and the impact-melt like breccia (totally weathered)(4) exposed in the Tavaí city provided evidence of impact metamorphism (PDFs in quartz). In both breccias we investigated other...

A microscopic introductory examination of the quartzite exposed in the city of San Miguel (1), quartzite and impact-melt (acid rock) dikes of the quarry of Itá Yurú and the calco-silicate rock, also, exposed in the city of Villa Florida - the domains of the central peak of the impact crater San Miguel (2) provided evidence of the presence of impact...

Black micro crystal (0.25mm) that shows the typical staggered fractures of the diamond on one edge. Concentrate of pans of heavy minerals from the highly weathered impact breccia. It is noted part of the clay from the target rocks. Preliminary test. A multidisciplinary work of team of Paraguay (ONGAgua, Fiuna, Facen), team of Argentina (Ushuaia-Uni...

The petrographic study of two samples (quartzite and impactite) of Cerro León, a mountain range located in the middle of very probable impact basins (Cerro Leon-1, 2, 3 and 4-department of Alto Paraguay, Western-Paraguay) indicated evidences of impact metamorphism: PDFs (Not decorated and decorated) and diaplectic glass. Associated with diaplectic...

SGFI93-117 seismic profile edited with high contrast. The government of the Falkland Islands provided permission to consult Geco Prakla’s seismic-reflection profiles from the site of the proposed basin. To the government of the Falkland Islands thank you very much. C 1 CLIENT NEPS COMPANY GECO CREW NO C 2 LINE 100 AREA FALKLAND ISLANDS MAP ID C 3 R...

SGFI93-117 seismic profile portion edited with ultra high contrast Area of the profile where it is interpreted is evidenced the ring-crest and the central basin

Offshore residual magnetic anomalies of the Falklands/Malvinas Islands area. An evident “rose”- like 250 kilometer-wide circular positive anomaly is present in the area of the gravity anomalies associated with a suggested impact structure. See the article by Rocca et al. pp 233-237. (Source: National Centers for Environmental Information: http://ge...

NW-SE Profile of Line 117: EMAG2 Source of data: 2X2 http://geomag.org/models/index.html nT x 1000

NW-SE Profile of Line 117: freeair Source of data: 1X1 ftp://topex.ucsd.edu/pub/global_grav_1min_alt/ Values in milligal

NW-SE Profile of Line 117: bouguer Source of data: 2X2 http://bgi.omp.obs-mip.fr/activities/Projects/world_gravity_map_wgm Values in milligal

NW-SE Profile of Line 117: Isostasy Source of data: 2X2 http://bgi.omp.obs-mip.fr/activities/Projects/world_gravity_map_wgm Values in milligal

MAPCIS in global vision of Vertical Gravity Gradient from: http://portal.gplates.org/cesium/ VGG information is a powerful tool for defining structures. The Acraman impact crater is noted for comparison.

MAPCIS Ideal crater dimension in kilometers 350-R thick dashed line 300-R fine dashed line. CT from bouguer 2X2 gravimetric data from http://bgi.omp.obs-mip.fr/activities/Projects/world_gravity_map_wgm

MAPCIS Ideal crater dimension in kilometers 350-R thick dashed line 300-R fine dashed line. 2X2 gravimetric data from http://bgi.omp.obs-mip.fr/activities/Projects/world_gravity_map_wgm

The Cerro León quartzite is rich in diamonds/lonsdaleite, in some fragments a blue ore similar to ringwoodite was identified. Photo of a diamond/lonsdaleite of 0.3 mm as likely ringwoodite

Yasuka Rendá Impact Crater, E-Paraguay, impact melt (Of matte green color, porphyritic texture (white feldspar phenocrysts) and visible spherulites (white), submillimetric submerged in fine sediment matrix.

The Moho is upwarped by ~1.5-2 km near the center of the Chicxulub crater (Christeson et al., 2009 -doi:10.1016/j.epsl.2009.04.033)....180Km-D. In Malvinas or Falkland It was found that the deformation (upwarped ) would be 3,4 Km (3400 m). As can be deduced from the profile A-B on the gravimetric anomaly of the Malvinas/Falkland......250 Km-D. CT-...

The Moho is upwarped by ~1.5-2 km near the center of the Chicxulub crater (Christeson et al., 2009 -doi:10.1016/j.epsl.2009.04.033)....180Km-D. In MAPCIS It was found that the deformation (upwarped ) would be 14-15 Km (14000-15000 m). As can be deduced from the profile on the gravimetric anomaly of the MAPCIS......600 Km-D. CT- Calculated from grav...

MAPCIS Ideal crater dimension in kilometers 350-R thick dashed line 300-R fine dashed line. 2X2 gravimetric data from http://bgi.omp.obs-mip.fr/activities/Projects/world_gravity_map_wgm

In the present work is carried out the description of geology, mineral chemistry, geochemistry, and characterization of the Yzu-4 intrusion that occurs in the Ybytyruzú lamproites field, Eastern Paraguay. According to the petrography and mineral chemistry, with reinforcements of rock chemistry (major, minor and traces elements and isotopes of Sr an...

A large, roughly circular structural basin is recognised on the Falkland (Malvinas) Plateau to the NW of West Falkland (Gran Malvina) Island (S 51°00′, W 62°00′). The basin, seen in seismic-reflection profiles and evident as a large negative gravity anomaly, has a diameter of ~250 km. The age of the basin is estimated to be Late Palaeozoic. It is c...

The petrographic study of two samples (quartzite and impactite) of Cerro León, a mountain range located in the middle of very probable impact basins (Cerro Leon-1, 2, 3 and 4 -department of Alto Paraguay, Western-Paraguay) indicated evidences of impact metamorphism: PDFs (Not decorated and decorated) and diaplectic glass......... Submitted for publ...

Diamonds in Eastern-Paraguay began to be recognized in the 60s of last century near the town of Capiibary Dept. San Pedro; but it was only formalized the occurrence in 2008. In Capiibary and around, over 100 macro (1 ~ 3 mm) diamond (colorless, shades of brown and rare shades of pink, blue and green) were recovered from alluvial deposits. Micro-dia...