title: Pyrite geochemistry and textures in the epithermal Au-Ag mineralisation at Waihi

authors: Eames, Anna G.

abstract: The Waihi epithermal system is a low sulphidation epithermal system that hosts one of the largest high grade ore deposits in the Southern Hemisphere. The use of petrographic and EPMA analyses demonstrate there are distinctive textural zones within pyrite grains that vary in chemistry and appearance. Some of these zones contain elevated concentrations of Au and Te, and varying concentrations of Fe, S, Cu, Pb or Zn. The textural observations indicate that in some samples, pyrite growth was interrupted by periods of dissolution. Grains begin growth with overall low trace element concentrations, with the highest concentrations of trace elements occurring in the middle phase of the grain’s growth. Inclusions are rich in Pb, Ca, Se, Zn and Ni, and are attributed to the ‘dirty’ texture of some samples. Inclusion-rich areas are also high in Au. The nature of the presence of Te suggests either a single source of magmatic fluid, released in pulses, or periodical dilution of the magmatic fluid by meteoric waters.

text: Pyrite geochemistry and textures in the epithermal Au-Ag mineralisation at Waihi The Waihi epithermal system is a low sulphidation epithermal system that hosts one of the largest high grade ore deposits in the Southern Hemisphere. The use of petrographic and EPMA analyses demonstrate there are distinctive textural zones within pyrite grains that vary in chemistry and appearance. Some of these zones contain elevated concentrations of Au and Te, and varying concentrations of Fe, S, Cu, Pb or Zn. The textural observations indicate that in some samples, pyrite growth was interrupted by periods of dissolution. Grains begin growth with overall low trace element concentrations, with the highest concentrations of trace elements occurring in the middle phase of the grain’s growth. Inclusions are rich in Pb, Ca, Se, Zn and Ni, and are attributed to the ‘dirty’ texture of some samples. Inclusion-rich areas are also high in Au. The nature of the presence of Te suggests either a single source of magmatic fluid, released in pulses, or periodical dilution of the magmatic fluid by meteoric waters.

year: 2016

title: Mitochondrial DNA genomes of five major Helicoverpa pest species from the Old and New Worlds (Lepidoptera: Noctuidae)

authors: Walsh, Tom K.

subjects: Science & Technology

abstract: Five   species of  noctuid moths, Helicoverpa armigera, H. punctigera, H. assulta, H. zea,and H. gelotopoeon, are major    agricultural pests   inhabiting various and  often   over  ‐lapping global    distributions. Visual     identification of  these    species requires a  great   deal   of  expertise and  misidentification can  have   repercussions for  pest   managementand   agricultural biosecurity. Here,    we   report on   the   complete mitochondrial ge ‐nomes of H. assulta assulta and H. assulta afra, H. gelotopoeon,  H. punctigera,  H. zea, and H. armigera armigeraand H. armigera conferta’assembled from   high‐throughputsequencing data.    This   study    significantly increases the   mitogenome resources for  these   five   agricultural pests    with   sequences assembled from   across    different conti   ‐nents,     including an H. armigeraindividual collected from  an invasive population in Brazil. We   infer    the   phylogenetic relationships of  these    five Helicoverpa speciesbased    on   the   13   mitochondrial DNA    protein‐coding genes    (PCG's) and   show    that   two   publicly available mitogenomes of H. assulta (KP015198 and   KR149448) have   been    misidentified or  incorrectly assembled. We   further consolidate existing PCR‐RFLP    methods to  cover    all   five Helicoverpa pest   species, providing an  updatedmethod that   will   contribute to  species differentiation and   to  future     monitoring ef ‐forts    of Helicoverpa pest    species across     different continents. We   discuss the   value   of Helicoverpa mitogenomes to  assist    with   species identification in  view   of  the   con  ‐text   of  the   rapid    spread of H. armigera in the  New   World.     With   this   work,    we  providethe   molecular resources necessary for   future    studies of  the   evolutionary history and  ecology of these species.

text: Mitochondrial DNA genomes of five major Helicoverpa pest species from the Old and New Worlds (Lepidoptera: Noctuidae) Five   species of  noctuid moths, Helicoverpa armigera, H. punctigera, H. assulta, H. zea,and H. gelotopoeon, are major    agricultural pests   inhabiting various and  often   over  ‐lapping global    distributions. Visual     identification of  these    species requires a  great   deal   of  expertise and  misidentification can  have   repercussions for  pest   managementand   agricultural biosecurity. Here,    we   report on   the   complete mitochondrial ge ‐nomes of H. assulta assulta and H. assulta afra, H. gelotopoeon,  H. punctigera,  H. zea, and H. armigera armigeraand H. armigera conferta’assembled from   high‐throughputsequencing data.    This   study    significantly increases the   mitogenome resources for  these   five   agricultural pests    with   sequences assembled from   across    different conti   ‐nents,     including an H. armigeraindividual collected from  an invasive population in Brazil. We   infer    the   phylogenetic relationships of  these    five Helicoverpa speciesbased    on   the   13   mitochondrial DNA    protein‐coding genes    (PCG's) and   show    that   two   publicly available mitogenomes of H. assulta (KP015198 and   KR149448) have   been    misidentified or  incorrectly assembled. We   further consolidate existing PCR‐RFLP    methods to  cover    all   five Helicoverpa pest   species, providing an  updatedmethod that   will   contribute to  species differentiation and   to  future     monitoring ef ‐forts    of Helicoverpa pest    species across     different continents. We   discuss the   value   of Helicoverpa mitogenomes to  assist    with   species identification in  view   of  the   con  ‐text   of  the   rapid    spread of H. armigera in the  New   World.     With   this   work,    we  providethe   molecular resources necessary for   future    studies of  the   evolutionary history and  ecology of these species.

year: 2019-03-01

title: Lake weed and the Rotorua Te Arawa Lakes then and now

authors: Burton, Tracy

abstract: This afternoon we will be looking beneath the surface of the Rotorua
Te Arawa lakes at the submerged aquatic plants that grow within them – the good the bad and the ugly. We will have a look at the special native aquatic plants that occur naturally in the lakes, familiarise ourselves with the weed species that have invaded them and look at how these weeds have (and are) changed the natural condition of the lakes. We will also look at how submerged plants are being used to report on the condition of our lakes and what these plant communities can tell us about the state of the lakes yesterday and today.

text: Lake weed and the Rotorua Te Arawa Lakes then and now This afternoon we will be looking beneath the surface of the Rotorua
Te Arawa lakes at the submerged aquatic plants that grow within them – the good the bad and the ugly. We will have a look at the special native aquatic plants that occur naturally in the lakes, familiarise ourselves with the weed species that have invaded them and look at how these weeds have (and are) changed the natural condition of the lakes. We will also look at how submerged plants are being used to report on the condition of our lakes and what these plant communities can tell us about the state of the lakes yesterday and today.

year: 2017