page_title: Negra Muerta volcanic complex
hierarchical_section_title: Negra Muerta volcanic complex
caption_attribution_description: Español: Abra del Acay, Provincia de Salta (Argentina). Deutsch: Abra el Acay, Provinz Salta (Argentinien). English: Abra del Acay, Salta province (Argentina). Italiano: Abra del Acay, Provincia di Salta (Argentina). Svenska: Abra del Acay, Salta (Argentina).
context_page_description: Negra Muerta is a caldera in Argentina. It is part of the volcanic centres of the Andean Volcanic Belt, which has formed a number of calderas in large ignimbrite producing eruptions. These calderas include Aguas Calientes, Cerro Panizos, Galan, Negra Muerta and La Pacana. Some of these volcanic centres appear to be associated with large fault zones that cross the Puna.
  Negra Muerta is a caldera with dimensions of 12 by 7 kilometres that was formed over two volcanic periods, one about 9 million years ago and another over 7 million years ago. Each volcanic period included the formation of ignimbrites, the Acay ignimbrite in the first and the Toba 1 ignimbrite in the second. After the Toba 1 ignimbrite, effusive activity forming lava flows occurred. After the cessation of volcanic activity, glacial and fluvial erosion has exposed subvolcanic structures.
context_section_description: Negra Muerta is a caldera in Argentina. It is part of the volcanic centres of the Andean Volcanic Belt, which has formed a number of calderas in large ignimbrite producing eruptions. These calderas include  Aguas Calientes, Cerro Panizos, Galan, Negra Muerta and La Pacana. Some of these volcanic centres appear to be associated with large fault zones that cross the Puna.
  Negra Muerta is a caldera with dimensions of 12 by 7 kilometres (7.5 mi × 4.3 mi) that was formed over two volcanic periods, one about 9 million years ago and another over 7 million years ago. Each volcanic period included the formation of ignimbrites, the Acay ignimbrite in the first and the Toba 1 ignimbrite in the second. After the Toba 1 ignimbrite, effusive activity forming lava flows occurred. After the cessation of volcanic activity, glacial and fluvial erosion has exposed subvolcanic structures.
caption: View from Abra del Acay over the caldera towards Nevado del Acay
exif: {"Image ImageDescription": "", "Image Make": "SONY", "Image Model": "DSC-W12", "Image Orientation": "Horizontal (normal)", "Image XResolution": "72", "Image YResolution": "72", "Image ResolutionUnit": "Pixels/Inch", "Image DateTime": "2007:01:28 12:57:32", "Image YCbCrPositioning": "Co-sited", "Image ExifOffset": "256", "Image PrintIM": "[80, 114, 105, 110, 116, 73, 77, 0, 48, 50, 53, 48, 0, 0, 2, 0, 2, 0, 1, 0, 0, 0, 1, 1, 3, 0, 0, 0]", "Thumbnail Compression": "JPEG (old-style)", "Thumbnail Make": "SONY", "Thumbnail Model": "DSC-W12", "Thumbnail Orientation": "Horizontal (normal)", "Thumbnail XResolution": "72", "Thumbnail YResolution": "72", "Thumbnail ResolutionUnit": "Pixels/Inch", "Thumbnail DateTime": "2007:01:28 12:57:32", "Thumbnail JPEGInterchangeFormat": "2482", "Thumbnail JPEGInterchangeFormatLength": "14346", "EXIF ExposureTime": "1/640", "EXIF FNumber": "28/5", "EXIF ExposureProgram": "Landscape Mode", "EXIF ISOSpeedRatings": "100", "EXIF ExifVersion": "0220", "EXIF DateTimeOriginal": "2007:01:28 12:57:32", "EXIF DateTimeDigitized": "2007:01:28 12:57:32", "EXIF ComponentsConfiguration": "YCbCr", "EXIF CompressedBitsPerPixel": "8", "EXIF ExposureBiasValue": "0", "EXIF MaxApertureValue": "3", "EXIF MeteringMode": "Pattern", "EXIF LightSource": "Unknown", "EXIF Flash": "Flash did not fire, compulsory flash mode", "EXIF FocalLength": "79/10", "EXIF FlashPixVersion": "0100", "EXIF ColorSpace": "sRGB", "EXIF ExifImageWidth": "2048", "EXIF ExifImageLength": "1536", "Interoperability InteroperabilityIndex": "R98", "Interoperability InteroperabilityVersion": "[48, 49, 48, 48]", "EXIF InteroperabilityOffset": "2276", "EXIF FileSource": "Digital Camera", "EXIF SceneType": "Directly Photographed", "EXIF CustomRendered": "Normal", "EXIF ExposureMode": "Auto Exposure", "EXIF WhiteBalance": "Auto", "EXIF SceneCaptureType": "Landscape", "EXIF Contrast": "Normal", "EXIF Saturation": "Normal", "EXIF Sharpness": "Normal"}